Use ci to build binary wheels?

Author: dengwirda

.travis.yml

@@ -0,0 +1,44 @@
+language: python
+jobs:
+  include:
+    - name: "Linux py35:py38"
+      services: docker
+      sudo: required
+      language: python
+      python: 3.8
+      env:
+        - CIBW_BUILD="cp35-* cp36-* cp37-* cp38-*"
+
+    - name: "MacOS py35:py38"
+      os: osx
+      language: shell
+      env:
+        - CIBW_BUILD="cp35-* cp36-* cp37-* cp38-*"
+
+    - name: "Windows py35:py38"
+      os: windows
+      language: shell
+      before_install:
+        - choco install python --version 3.8.0
+        - export PATH="/c/Python38:/c/Python38/Scripts:$PATH"
+        # make sure it's on PATH as 'python3'
+        - ln -s /c/Python38/python.exe /c/Python38/python3.exe
+      env:
+        - CIBW_BUILD="cp35-* cp36-* cp37-* cp38-*"
+env:
+  global:
+    - TWINE_USERNAME=__token__
+    - CIBW_BEFORE_ALL="python3 setup.py build_external"
+install:
+- python3 -m pip install --upgrade setuptools wheel
+- python3 -m pip install cibuildwheel==1.6.1
+script:
+- python3 -m cibuildwheel --output-dir dist
+after_success:
+  # if the release was tagged, upload them to PyPI
+  - |
+    if [[ $TRAVIS_TAG ]]; then
+      python3 -m pip install twine
+      python3 -m twine upload --verbose --skip-existing dist/*
+    fi
+