Slim down CI stages

Author: dcodeIO

.travis.yml

@@ -6,20 +6,14 @@ install: npm config set progress=false && npm i --no-audit
 cache:
   directories:
   - node_modules
-stages:
-- name: check-pr
-  if: type = pull_request
 jobs:
   include:
 
-  - stage: check-pr
-    node_js: lts/*
-    script: ./scripts/check-pr.sh
-    env: Checks contributing guidelines before testing pull requests
-
-  - stage: lint
+  - stage: check
     node_js: node
-    script: npm run lint
+    script:
+    - if [ "$TRAVIS_PULL_REQUEST" != "false" ]; then ./scripts/check-pr.sh; fi
+    - npm run lint
     env: Checks the sources with TSLint
 
   - stage: test
@@ -30,6 +24,7 @@ jobs:
     script: npm run clean && node bin/asc -v && npm test
     env: Tests the sources on latest stable node.js
   - node_js: lts/*
+    if: branch = master AND type = push
     script:
     - npm run clean
     - cd $TRAVIS_BUILD_DIR/tests/allocators/arena && npm run build && cd .. && npm test arena