Increment version number to 2.5.0

Remove unneeded argument doc

Fix doc typo

Fix broken url

Fix typo

Increment version number to 2.3.1

Increment version number to 2.3.0

Release 2.2.1 (#923)

* Polish NEWS

* Build README

* Increment version number to 2.2.1

* revdepcheck

Increment version number to 2.2.0

Increment version number