travis.yml: only run full awesome_bot tests on monthly-check branch

fixes https://github.com/awesome-selfhosted/awesome-selfhosted/issues/2209

.travis.yml

@@ -15,14 +15,8 @@ before_script:
 script:
   - 'if [ "$TRAVIS_PULL_REQUEST" != "false" ]; then git diff origin/master -U0 README.md | grep -Pos "(?<=^\+).*" >> temp.md; fi || (exit 0)'
   - 'if [ "$TRAVIS_PULL_REQUEST" != "false" ]; then node tests/test.js -r README.md -d temp.md; else node tests/test.js -r README.md; fi'
-  - 'if [ "$TRAVIS_PULL_REQUEST" != "false" ]; then if [ -f temp.md ]; then awesome_bot temp.md --allow-redirect --skip-save-results --allow 202 --white-list airsonic.github.io/docs/apps; else (exit 0); fi else awesome_bot *.md --allow-redirect --skip-save-results --allow 202 --white-list airsonic.github.io/docs/apps; fi'
+  - 'if [ "$TRAVIS_PULL_REQUEST" != "false" ]; then awesome_bot temp.md --allow-redirect --skip-save-results --allow 202 --white-list airsonic.github.io/docs/apps; else (exit 0); fi'
+  - 'if [ "$TRAVIS_BRANCH" == "monthly-check" ]; then awesome_bot *.md --allow-redirect --skip-save-results --allow 202 --white-list airsonic.github.io/docs/apps; fi'
 
-  
 notifications:
   email: false
-
-branches:
-  only:
-  - master
-  - travis_test
-