Add GitHub action for CI

Change-Id: I855ae2c78e0346393270bdce54c637f741dd138b
diff --git a/Changes b/Changes
index c95b9f0..0484e2f 100644
--- a/Changes
+++ b/Changes
@@ -1,8 +1,9 @@
-0.42 2021-02-16
+0.42 2021-03-16
         - Replaced Log4perl with Log::Any.
         - Ignore level < 0 structures in DeReKo, but support
           them for base annotations.
         - Define resources in Makefile.
+        - Add GitHub action for CI.
 
 0.41 2020-08-10
         - Added support for RWK annotations.