Document changes and release 1:91.0~b1-1

debian/changelog

+thunderbird (1:91.0~b1-1) experimental; urgency=medium
+
+  * [78f0ddb] d/source.filter: some updates to filtering list
+  * [3d29fcf] New upstream version 91.0~b1
+    (Closes: #990631)
+  * [daa7fab] d/control: Increase some Build-Depends
+  * [f4bfd22] d/control: Remove libgtk2.0-dev from Build-Depends
+  * [ad4e281] d/s/lintian-overrides: Adding one more file to ignore
+
+ -- Carsten Schoenert <c.schoenert@t-online.de>  Mon, 19 Jul 2021 22:04:15 +0200
+
 thunderbird (1:90.0~b2-1) experimental; urgency=medium
 
   [ Carsten Schoenert ]