2.0.0

Change Log:

• ignore phpunit.xml & rename to phpunit.xml.dist fix #16
• exclude 'tests' & 'vendor' from calc code coverage. closes #18
• code style rules; add .editorconfig
• migrate to phpunit 6.5. closes #7. & Update PhpUnit to 7.5. Closes #27
• migrate to mockery 1.0. closes #19
• drop support for php 5, 7.0 & hhvm (fixes builds)
• php docblocks for tests. closes #8
• decrease Attachment::__contruct() complexity. closes #9
• rename attributes to options
• decrease Client::__construct() complexity. closes #12
• Added response_type to allow for 'in_channel' vs 'emphemeral' messages in channel
• Blocks support (Integrate Blocks with main Message/Client) by @cmbuckley:
  • Button element and Confirmation object
  • Checkboxes element and Option object
  • DatePicker element
  • Image element
  • Overflow element
  • TextInput element
  • RadioButtons element
  • Select element and OptionGroup object
  • MultiSelect element
  • Actions block
  • Context block
  • Divider block
  • File block
  • Image block
  • Input block
• Fix php doc-blocks. Closes #39.
• correct initial option check (fixes #40)
• add travis notification to Slack. Closes #17.
• fix class name. fix #45
• Improve test coverage for Block kit
• Added callback_id to Attachment.php (#50) to allow for working with the interactivity callback api in slack
• bugfix: prevent call on non-object
• Update Composer and PHPUnit to PHP 8.0 (#56)
• reuse Payload for fillProperties() (decrease complexity). resolves #13
• decouple Message from Client. Closes #15, fixes maknz#70