enable Travis CI and AppVeyor

.travis.yml

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+language: python
+python: "3.5"
+dist: trusty
+sudo: true
+before_install:
+  - sudo apt update && sudo apt install -y enchant
+install:
+  - pip install -U setuptools
+  # install_requires
+  - pip install -U git+https://github.com/colcon/colcon-core
+  - pip install -U PyYAML
+  # tests_require
+  - pip install -U flake8-blind-except flake8-builtins flake8-class-newline flake8-comprehensions flake8-deprecated flake8-docstrings flake8-quotes pep8-naming pyenchant pylint pytest pytest-cov
+script:
+  # invoke pytest
+  - pytest --cov=colcon_mixin --cov-branch
+notifications:
+  email: false

appveyor.yml

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+version: '{build}'
+environment:
+  matrix:
+    - PYTHON: "C:\\Python35-x64"
+install:
+  - "%PYTHON%\\python.exe -m pip install -U setuptools"
+  # install_requires
+  - "%PYTHON%\\python.exe -m pip install -U git+https://github.com/colcon/colcon-core"
+  - "%PYTHON%\\python.exe -m pip install -U PyYAML"
+  # tests_require, except pyenchant
+  - "%PYTHON%\\python.exe -m pip install -U flake8-blind-except flake8-builtins flake8-class-newline flake8-comprehensions flake8-deprecated flake8-docstrings flake8-quotes pep8-naming pylint pytest pytest-cov"
+build: off
+test_script:
+  # invoke pytest
+  - "%PYTHON%\\python.exe -m pytest --cov=colcon_mixin --cov-branch"