Fix ci issue

.travis.yml

@@ -4,10 +4,11 @@ jobs:
   include:
     - name: "CI on Windows/Python3.6"
       os: windows
-      python: 3.6
-    - name: "CI on MacOS/Python3.6"
-      os: osx
-      python: 3.6
+      language: shell
+      before_install:
+        - choco install python --version 3.6.0
+        - python -m pip install --upgrade pip
+      env: PATH=/c/Python36:/c/Python36/Scripts:$PATH
     - name: "CI on Linux/Python3.6"
       os: linux
       python: 3.6
@@ -18,10 +19,12 @@ jobs:
       os: linux
       python: 2.7
 
+env:
+  - PYTHONPATH=${PWD}
+
 install:
   - pip install --upgrade paddlepaddle
   - pip install -r requirements.txt
-  - pip install .
 
 script:
   - if [[ $TRAVIS_PYTHON_VERSION != 2.7 ]]; then /bin/bash ./scripts/check_code_style.sh; fi