Prepare for development of next release

Prepare v11.0.0 release

Update CHANGELOG

Merge pull request #51 from amedama41/fix_docutils_tree

Fix generating non well-formed docutils document tree

.travis.yml: use xenial for Python 3.5

.travis.yml: build on bionic, not trusty

.travis.yml: drop Python 3.4, add 3.6 and 3.7

Merge pull request #50 from amarin/master

Set detailed message formatted strong by default, regular font is optional by detailed-message-strong: False

added documentation for hide_author, hide_date and detailed-message-strong arguments

added option detailed-message-strong:bool (=False by default) to display commit message in bold

display commit message in plain text, not bold

Add a demo picture to README

Prepare for development of next release