Merge pull request #3125 from privacyidea/update_changelog_for_v3.7.1

Update changelog for v3.7.1

Changelog

+Version 3.7.1, 2022-05-09
+
+  Fixes:
+  * Fix WebUI login with HOTP/TOTP challenge-response token (#3038)
+  * Improve error handling for "/ttype" endpoint (#3090)
+  * Removed redundant "user" option from offline token assignment (#3077)
+  * Fix creation of download-links for certificates due to HTML sanitizer (#3088)
+  * Fix policy descriptions containing HTML-like tags (#3118)
+  * Add documentation for the CustomUserAttributeHandler (#3075)
+  * Send Push message as notification and data to FireBase (#3117)
+
+  Enhancements:
+  * Add App-PIN policy for Push token (#3116)
+
 Version 3.7, 2022-03-31
 
   Features: