Imported Upstream version 0.20.0
Merge tag 'upstream/0.20.0'

Upstream version 0.20.0
  * Use sphinxdoc option from debhelper to build the documentation:
    - debian/control: Added missing dependency on python(3)-sphinx.
    - debian/python-doit-doc.links: removed, now handled by sphinxdoc.
    - debian/rules: Clean-up symlinks
Fixed author in debian/python-doit-doc.doc-base file
Added call to run test cases
Updated home page url
Replaced "DoIt" for "doit" asked by the upstream author
Improved package description
Update changelog