* remove supports for python 2.7 * fix the unit test for python 3.5 * add python 3.8 in CI * try ubuntu 18.04 as the environment
* add copyright header * change # to // for cpp files
* add yapf and isort to travis * minor formatting * remove blank lines * skip unit tests for progressbar when python2 * update travis to ubuntu 16.04 * use a newer version ffmpeg * add -y to add-apt-repository