apply travis only for master branch (#4163)

* apply travis ci only for master branch

* fix bug

Author: chenxsan

.travis.yml

@@ -10,57 +10,12 @@ cache:
     - repositories
 
 stages:
-  - Lint
-  - Test
   - Build
 
 jobs:
   fast_finish: true
 
   include:
-    - stage: Lint
-      name: Lint
-      env: CACHE_TYPE=lint
-      script:
-        - yarn lint:js || travis_terminate 1
-        - yarn lint:markdown || travis_terminate 1
-        - yarn lint:social || travis_terminate 1
-
-    - stage: Lint
-      name: Proselint
-      language: python
-      env: CACHE_TYPE=proselint
-      python: 3.6
-      cache:
-        yarn: false
-        npm: false
-        pip: true
-        directories:
-          - $HOME/.cache
-      install: pip install -r requirements.txt
-      script: cp .proselintrc ~/ && proselint src/content
-
-    - stage: Test
-      name: Cypress
-      env: CACHE_TYPE=lint
-      node_js: "10"
-      install:
-        - yarn
-        - yarn cypress install
-        - yarn cypress verify
-      script:
-        - yarn fetch:supporters
-        - yarn fetch:starter-kits
-        - yarn cypress:ci || travis_terminate 1
-
-    - stage: Build
-      name: Build
-      if: branch != master OR type NOT IN (push, cron)
-      env: CACHE_TYPE=build
-      script:
-        - yarn build || travis_terminate 1
-        - yarn lint:links || travis_terminate 1
-
     - stage: Build
       name: Build and Deploy
       if: branch = master AND type IN (push, cron)