[mod] use github actions instead of travis

fix https://github.com/searx/searx/issues/2279

.coveragerc

@@ -1,15 +1,6 @@
 [run]
 branch = True
-source =
-  searx/engines
-  searx/__init__.py
-  searx/autocomplete.py
-  searx/https_rewrite.py
-  searx/languages.py
-  searx/search.py
-  searx/testing.py
-  searx/utils.py
-  searx/webapp.py
+source = searx
 
 [report]
 show_missing = True