Merge branch '5.1' into 5.2

* 5.1:
  Fix licence
  Fix CS in link binary
  [Cache] remove no-op
  Fix CS in Changelogs
  [Notifier][Sinch] Add tests
  [Notifier] [Nexmo] Add tests
  [Notifier][OvhCloud] Add tests
  [Notifier] [Free Mobile] Rename method to match other bridges
  [Cache] fix setting "read_timeout" when using Redis
  Fix CS in changelogs
  [Notifier] Streamline README files

Author: derrabus

CHANGELOG.md

@@ -24,11 +24,11 @@ CHANGELOG
 5.1.0
 -----
 
-* Added the Mattermost notifier bridge
-* [BC BREAK] The `ChatMessage::fromNotification()` method's `$recipient` and `$transport`
-  arguments were removed.
-* [BC BREAK] The `EmailMessage::fromNotification()` and `SmsMessage::fromNotification()`
-  methods' `$transport` argument was removed.
+ * Added the Mattermost notifier bridge
+ * [BC BREAK] The `ChatMessage::fromNotification()` method's `$recipient` and `$transport`
+   arguments were removed.
+ * [BC BREAK] The `EmailMessage::fromNotification()` and `SmsMessage::fromNotification()`
+   methods' `$transport` argument was removed.
 
 5.0.0
 -----