[maven-release-plugin] copy for tag v3.0.6

[maven-release-plugin] copy for tag messagebird-api-3.0.6

[maven-release-plugin] copy for tag v3.0.5

[maven-release-plugin] copy for tag v3.0.4

[maven-release-plugin] copy for tag v3.0.3

[maven-release-plugin] copy for tag v3.0.2

[maven-release-plugin] copy for tag messagebird-api-3.0.1

Add support for updating Conversations webhooks

* Added update conversation webhook call

includes unit tests

Refactoring ConversationWebhookTest to use mocking instead of Spying service

Refactored DTOs

* Added an example for updating conversation webhook

* Fixed comments on PR and upgraded to Java 11

Added status to ConversationWebhook

Reverted Conversation web hook request for backwards compatibility

Extracted creation of objects used in tests to TestUtil

Added support for default values in example of testing update of conversation web hook

* Updated travis ci to support Oracle JDK 11

* Updated major version

* Renaming of DTO and testing against 11th of oracle and open jdks

* Updated README.md

* Updated travis ci job to remove matrix that was causing an extra build job to run

[maven-release-plugin] copy for tag 2.1.1

Merge pull request messagebird#53 from klpx/patch-1

Bump http client version