fix macos ci for lower version macos is not compatible with higher binary (#102)

Author: cyjseagull

.travis.yml

@@ -20,25 +20,6 @@ matrix:
     - name: "Python 3.5 on Xenial Linux"
       python: 3.5
       dist: xenial
-    - name: "Python 3.7.2 on macOS"
-      os: osx
-      osx_image: xcode10.14.3  # Python 3.7.2 running on macOS 10.14.3
-      language: shell       # 'language: python' is an error on Travis CI macOS
-      before_install:
-        - bash -x init_env.sh -p
-        - source ~/.bashrc
-        - pyenv global 3.7.3
-        - pip install --upgrade pip
-        - pip install -r requirements.txt
-        - bash init_env.sh -i
-    # - name: "Python 3.7.3 on Windows"
-    #   os: windows           # Windows 10.0.17134 N/A Build 17134
-    #   language: shell       # 'language: python' is an error on Travis CI Windows
-    #   before_install:
-    #     - choco install python
-    #     - python -m pip install --upgrade pip
-    #     # - pip install configobj
-    #   env: PATH=/c/Python37:/c/Python37/Scripts:$PATH
 addons:
   apt:
     packages: