Fix test failure caused by version being 0.500 (python#2936)

Fix replace() that used the mypy version as the thing to replace,
which happened to match the string '0.5000' in the output of a test
case.

Release version 0.471

Bump version to 0.470

Bump version to 0.4.6

Add 0.4.5 release notes to documentation

Bump version to 0.4.4

Bump version to 0.4.3

Bump version to 0.4.2

Bump version to 0.4.1

Update version number to 0.4