Merge branch 'develop' into release-2.2

update docstrings

Merge pull request #62 from davidkowalk/fixing-broken-links

Minor changes to README

build only sdist

set version number 2.0.0

let version number be 1.1.0

Merge branch 'develop' into release-1.1

Merge branch 'develop' into merge

bump up version to v0.3.0