Cancelling Travis build with docs updates only. (#372)

.travis.yml

@@ -39,6 +39,16 @@ addons:
       - lcov
       - graphviz
 before_install:
+  - |
+    if [ ${JOB} == "BUILD_AND_TEST" ]; then
+      if [ "$TRAVIS_PULL_REQUEST" != "false" ]; then
+        TRAVIS_COMMIT_RANGE="FETCH_HEAD...$TRAVIS_BRANCH"
+      fi
+      git diff --name-only $TRAVIS_COMMIT_RANGE | grep -qvE '(\.md$)' || {
+        echo "Only markdown docs were updated, stopping build process."
+        exit
+      }
+    fi
   - if [[ "$TRAVIS_OS_NAME" == "linux" ]]; then sudo paddle/scripts/travis/before_install.linux.sh; fi
   - if [[ "$TRAVIS_OS_NAME" == "osx" ]]; then paddle/scripts/travis/before_install.osx.sh; fi
   - pip install wheel protobuf sphinx breathe recommonmark

README.md

@@ -14,7 +14,7 @@ developed by Baidu scientists and engineers for the purpose of applying deep
 learning to many products at Baidu.
 
 Our vision is to enable deep learning for everyone via PaddlePaddle.
-Please refer to our [release log](https://github.com/baidu/Paddle/releases) to track the latest feature of PaddlePaddle. 
+Please refer to our [release announcement](https://github.com/baidu/Paddle/releases) to track the latest feature of PaddlePaddle. 
 
 ## Features