Merge pull request #247 from projecthamster/feature/244

Drop python2 from 'travis.yml', add additional python3 versions

Remove broken links to legacy code

Remove version pinning for tox envs 'isort' and 'docs'

Remove version pinning for 'docs' requirements

Drop python2 from testsuite / tox

Fix import order

Change SQLAlchemy factories force flush parameter to new API

Change 'SafeConfigParser' to 'ConfigParser'

Mark failed test with 'xfail' after updated test suite

Remove version pinning for 'test.pip'

Adjust pytest section name in 'setup.cfg'

Merge branch 'release/0.13.2' into develop

Add infos on fixes to changelog

Bump version: 0.13.1 → 0.13.2