retry 3 times under CI

.circleci/config.yml

@@ -29,7 +29,12 @@ jobs:
       - run:
           name: Testing
           command: |
+            n=0
             ./script/docker.sh test
+            while ((n < 3 && $? > 0)); do
+              ((n++))
+              ./script/docker.sh test
+            done
       - deploy:
           name: Deploy Wechaty Image to Docker Hub
           command: |

.travis.yml

@@ -29,7 +29,7 @@ script:
   - echo $TRAVIS_OS_NAME
   - node --version
   - npm --version
-  - npm test
+  - n=0; npm test; while ((n < 3 && $? > 0)); ((n++)); do npm test; done
 
 after_success:
   - if [ "$TRAVIS_OS_NAME" == 'osx' ]; then npm run coverage; fi