improve ci configuration

Author: yyx990803

build/ci.sh

@@ -1,6 +1,5 @@
 set -e
-if [ -z "$CI_PULL_REQUEST" ]
-then
+if [ -z "$CI_PULL_REQUEST" ] || [ "$CIRCLE_BRANCH" == "master" ]; then
   npm run lint
   npm run cover
   cat ./coverage/lcov.info | ./node_modules/.bin/codecov

circle.yml

@@ -2,10 +2,6 @@ machine:
   node:
     version: 5
 
-general:
-  branches:
-    only: master
-
 test:
   override:
     - bash ./build/ci.sh