Bumps version to 1.3.8

Amends CHANGES.rst and bumos to version to 1.3.7

Bumps version to 1.3.6

Removes the ROADMAP.md

Bumps version to 1.3.4

Updates license date

Adds 1.3.2 release date to CHANGES.rst

Bump version to 1.3.1

Merge branch 'prepare_for_1.3_release'

Merge branch 'fix_base_url_issue_in_docs_conf_#376'