chore(generator): Run coveralls after success

Fix broken travis builds because of coveralls issue: lemurheavy/coveralls-public#1264

.travis.yml

@@ -12,7 +12,6 @@ before_install:
 before_script:
   - npm install -g yo
   - npm test
-  - npm run coveralls
 notifications:
   webhooks:
     urls:
@@ -50,3 +49,6 @@ script:
   - npm install
   - npm run build
   - npm run build:dev
+after_success:
+  - cd ..
+  - npm run coveralls