chore: Donot run semantic-release on pull request

Author: finom

.travis.yml

@@ -10,7 +10,9 @@ node_js:
 before_script:
   - npm prune
 after_success:
-  - npm run semantic-release
+  if ([ "$TRAVIS_PULL_REQUEST" == "false" ]); then
+    eval 'npm run semantic-release';
+  fi
 branches:
   except:
     - /^v\d+\.\d+\.\d+$/