add changelog notes for new feats

Author: UmanShahzad

CHANGELOG.md

@@ -2,6 +2,13 @@
 
 ### 2.0.0 (November 2020)
 
+- A `guzzle_opts` option is supported in the settings, which allows full Guzzle
+  option overrides.
+- A `timeout` option is supported in the settings, which is the request timeout
+  value, and defaults to 2 seconds.
+  **BREAKING**: this was previously unconfigurable and was 0 seconds,
+  i.e. infinite timeout.
 - The `buildHeaders` method on the main `IPinfo` client is now private.
+  **BREAKING**: this will no longer be available for use from the client.
 - Only non-EOL PHP 7 versions are supported. In particular, PHP 7.2 and above
   are all supported and tested in the CI.