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 #172: Update misc. validation error messages while working with knowledgebase categories and folders (vipin-shrivastava)
+    * Bug #167: Add cross-site scripting checks for uploaded .svg assets (vipin-shrivastava)
+    * Bug #166: Throw *NotFoundHttpException* instead to render *404 Page Not Found* error message when ticket is not found (vipin-shrivastava)
+    * Bug #164: Fix misc. issues while updating articles (vipin-shrivastava)
+    * Bug #163: Show warning when creating article with an already occupied slug name, update validation criteria when creating folders (vipin-shrivastava)
+    * Bug #160: Delete previous website logo asset from filesystem while updating a new logo (vipin-shrivastava)
+    * Bug #159: Delete knowledgebase folder image asset from file system when deleting folder (vipin-shrivastava)
+    * Bug #158: Editor resize issue while creating ticket (vipin-shrivastava)
+    * Bug #157: Use editor when creating ticket (vipin-shrivastava)
+    * Bug #156: Article's numbered list not being rendered correctly (vipin-shrivastava)
+    * Bug #155: Delete customer profile picture from file system when updating account details (papnoisanjeev)
+    * Bug #154: Fix wrong custom field placeholder value being rendered (vipin-shrivastava)