Fix build error due to travis

Author: tzutalin

.travis.yml

@@ -73,8 +73,9 @@ matrix:
       env:
         - PIPENV_VENV_IN_PROJECT=1
         - PIPENV_IGNORE_VIRTUALENVS=1
+      before_install:
+        - brew install python
       install:
-        - brew upgrade python
         - pip3 install pipenv
         - pipenv --three
         - pipenv run pip install pyqt5 lxml

build-tools/README.md

@@ -26,7 +26,6 @@ sh build-windows-binary.sh
 ### Build for macOS High Sierra
 ```
 cd build-tools
-chmod +x ./build-for-macos.sh
 ./build-for-macos.sh
 ```