Upgrading core to version to 0.21.0.

[dhermes]

As a result, also upgrading the umbrella package and all packages to 0.21.0 (since they all depend on core).

I'm a little terrified of release notes, but will take the first stab at it before I ask for help.

[tseaver]

Actual changes LGTM.

[daspecster]

Speech Release Notes:

## Cloud Speech API

The Google Cloud Speech API allows you to convert audio to text by applying
powerful neural network models in an easy to use API.

Speech methods:
- `sync_recognize()`
- `async_recognize()`
- `streaming_recognize()`

For more examples see: https://googlecloudplatform.github.io/google-cloud-python/stable/speech-usage.html

[dhermes]

#2600 caused some breakage in logging that will make a release a bit suboptimal, I think the most "pragmatic" thing to do is release as-is and then get a logging 0.21.1 out ASAP

[daspecster]

@dhermes what is broken?

[dhermes]

Release notes

---

Core

• Adding HappyBase to the umbrella package. (Adding HappyBase to the umbrella package. #2469)
• Re-architect Iterator class. (Making max_results part of the base Iterator class. #2490, Re-architect Iterator class. #2531, Moving backend specific behavior from Page to Iterator. #2545, Removing Iterator and Page subclasses. #2558, Moving iterator into a dedicated document. #2564, Removing Iterator.reset(). #2592, Implement Iterator.pages and simplify items iteration #2594, Refactor iterator to separate into HTTP/GAX iterators #2617)
• Auto-detecting project returns None if key missing from config file. (Return None if project key is missing. #2537)
• Add Gateway Timeout exception. (Add Gateway Timeout exception. #2575)
• Re-factoring Operation base class. (Re-factoring Operation base class. #2641)
• Passing along credentials from the current Client to GAX / gRPC transports. Fixes Gax pubsub ignores custom service account credentials and fetchs ADC instead #2631. (Explicitly passing a channel to GAPIC-generated API classes #2682)
• Handle timestamps with no nanoseconds at all. (Handle missing nanos. #2696)
• Making base connection module non-public and making connection attribute non-public. (Making base connection module non-public and making connection attribute non-public #2703)
• Pass along headers for (encrypted) multi-part downloads (Pass headers for streaming download. #2730)

BigQuery

• Clarify docs on last 5 minutes query (Clarify docs on last 5 minutes query #2461)
• Raise from Table.insert_data if schema not set. (Raise from 'Table.insert_data' if schema not set. #2478)
• Capture query attr when loading QueryJob from JSON resource. (Capture 'query' attr when loading 'QueryJob' from JSON resource. #2534)
• Updating Client methods list_projects, list_datasets and list_jobs to use Iterator. (Updating Client.list_* methods in BigQuery to use Iterators. #2561)
• Add AVRO as a valid source format (Add AVRO as a valid BigQuery SourceFormat #2628)
• BigQuery Dataset.list_tables and Table.fetch_data use an iterator. (Move BigQuery list_ methods to use iterators #2565)
• Renaming connection module as _http. Connection is no longer part of the public interface. (Renaming connection module as _http in 5 packages. #2690)

Datastore

• Catching gRPC error in datastore run_query and converting to our error. (Map gRPC errors in datastore run_query onto 'google.cloud.exceptions'. #2496)
• Remapping (almost) all RPC status codes to our exceptions in datastore. (Remapping (almost) all RPC status codes to our exceptions in datastore. #2590)
• Renaming connection module as _http. Connection is no longer part of the public interface. (Renaming connection module as _http in 5 packages. #2690)
• Migrate datastore query iterator to use base iterator class. (Migrate datastore iterator to use base iterator class #2706)

Storage

• Add Blob.compose API wrapper method. (Add 'Blob.compose' API wrapper method. #2506)
• Make encryption_key an attribute of Blob. (Make 'encryption_key' an attribute of the Blob. #2507)
• Add Blob.rewrite API wrapper method. (Add 'Blob.rewrite' API wrapper method.  #2510)
• Update Google Cloud Storage bucket classes. (Update Google Cloud Storage bucket classes. #2571)
• Renaming connection module as _http. Connection is no longer part of the public interface. (Renaming connection module as _http in 5 packages. #2690)

Pub / Sub

• Use correct publishTime field name for server-set message timestamp. (Use correct 'publishTime' field name for server-set message timestamp. #2533)
• Add use_gax to Client constructor to explicitly enabling/disable using gRPC / GAX. (Allows Explicitly Enabling/Disabling GAX for Logging/Pubsub #2553)
• Using Iterators for list_topics(). (Using Iterators for list_topics() in Pub/Sub. #2602)
• Converting Topic.list_subscriptions to use an iterator. (Converting Pub/Sub topic->list_subscriptions to iterator. #2618)
• Converting Client.list_subscriptions to use an iterator. (Converting Pub/Sub client->list_subscriptions to iterator. #2633)
• Renaming connection module as _http. Connection is no longer part of the public interface. (Renaming connection module as _http in 5 packages. #2690)

Logging

• Add use_gax to Client constructor to explicitly enabling/disable using gRPC / GAX. (Allows Explicitly Enabling/Disabling GAX for Logging/Pubsub #2553)
• Allowing for arbitrarily nested dictionaries in _log_entry_mapping_pb. (Allowing for arbitrarily nested dictionaries in _log_entry_mapping_pb. #2589)
• Change the version of the Logging API used from v2beta1 to v2 (Change the version of the Logging API from v2beta1 to v2 #2625)
• Converting Client.list_entries to use an iterator. (Converting Logging client->list_entries to iterator. #2636)
• Updating list_sinks to Iterator pattern. (Updating list_sinks() to Iterator pattern. #2652)
• Updating list_metrics to Iterator pattern. (Updating list_metrics() to Iterator pattern. #2653)
• Renaming connection module as _http. Connection is no longer part of the public interface. (Renaming connection module as _http in 5 packages. #2690)

Vision

• Properly encode image content. (Properly encode image content. #2528)

Language

• Add missing argument to annotate_text() docs. (add missing argument to annotate_text() docs #2543)

DNS

• Using Iterator for "list" methods. (Moving to iterators in DNS. #2560)

Runtime Config

• Implementation added. (Add support for RuntimeConfig API. #2485)

Translate

• Adding support for model translate parameter. Also, updating the base API URL and enabling standard credentials (service account or user credentials) to be used when no API key is provided (Update translation #2731)

Speech

• sync_recognize() (Basic implementation of Speech API. #2344 Thanks @Fematich!, Add Speech GAPIC for sync_recognize. #2615)
• async_recognize() (Add speech async gapic #2663, Add speech asynchronous recognize support. #2426)
• streaming_recognize() (Add speech streaming recognition. #2680)

---

@daspecster #2674 describes the breakage

[dhermes]

CircleCI green, Travis hasn't started yet. Merging.

[dhermes]

I am going to manually push releases now via (as in #2441):

$ cd ${PACKAGE}
$ python setup.py sdist bdist_wheel
$ twine upload dist/*

[dhermes]

Also updated and used https://gist.github.com/dhermes/a4e097f2f80fd490b256fc3aa2b4a46b to release https://pypi.python.org/pypi/google-cloud-natural-language/0.21.0