fix: removed coveralls from dependencies

Author: maxsbelt

.travis.yml

@@ -5,7 +5,6 @@ node_js:
 install:
   - npm install -g npm
   - npm install
-  - npm install coveralls
 script:
   - npm run lint
   - npm test
@@ -17,6 +16,7 @@ jobs:
     - stage: coverage
       node_js: lts/*
       script:
+        - npm install -g coveralls
         - npm run test -- --coverage && cat ./coverage/lcov.info | coveralls
     - stage: release
       node_js: lts/*