Merge branch 'improve/gitignore' into 'develop'

Prevent committing code coverage results to the repo

See merge request pleroma/pleroma!1128

.gitignore

@@ -38,3 +38,7 @@ erl_crash.dump
 
 # Prevent committing docs files
 /priv/static/doc/*
+
+# Code test coverage
+/cover
+/Elixir.*.coverdata