Add CHANGELOG-1.1.md

Author: Akshay Kumar

CHANGELOG-1.1.md

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+CHANGELOG for 1.1.x
+===================
+
+This changelog references any relevant changes introduced in 1.1 minor versions.
+
+* 1.1.0 (2022-03-23)
+    * Feature: Improved compatibility with PHP 8 and Symfony 5 components
+    * Bug #92: Check if replyTo headers is provided while processing mail content (vipin-shrivastava)
+    * Bug #90: Fix ErrorException thrown on empty $mailData['replyTo']. (fiftyz)
+    * Bug #88: Update mailbox configuration form placeholder values (vipin-shrivastava)
+    * Bug #87: Update search criteria when looking up relevant threads based on inReplyTo reference ids (vipin-shrivastava)