v1.6.0

• Enable crawlera on demand by setting CRAWLERA_FORCE_ENABLE_ON_HTTP_CODES

v1.5.1

• Remove username and password from settings since it's removed from crawlera.
• Include affected spider in logs.
• Handle situations when crawlera is restarted and reply with 407's for a few minutes
  by retrying the requests with a exponential backoff system.

v1.5.0

• Correctly check for bans in crawlera (Jobs will not get banned on non ban 503's).
• Exponential backoff when crawlera doesn't have proxies available.
• Fix dont_proxy=False header disabling crawlera when it is enabled.

v1.4.0

• Remove crawlera X-headers when crawlera is disabled
• Introduction of DEFAULT_CRAWLERA_HEADERS settings

v1.2.0

• Recommend middleware order to be 610 to run before RedirectMiddleware.
• Change default download timeout to 190s or 3 minutes 10 seconds (instead of 1800s or 30 minutes).
• Test and advertize Python 3 compatiblity.
• New crawlera/request and crawlera/request/method/* stats counts.
• Clear Scrapy DNS cache for proxy URL in case of connection errors.
• Distribute plugin as universal wheel.