Merge pull request conveyal#438 from conveyal/dev

R5 Release

fix(readme): change release section to note use of maven-semantic-rel…

…ease

Release v4.1.1

release v4.1.0

Release 4.0.0

Release 3.4.1

Release 3.4.0

Release 3.3.0

Release 3.2.0

Release 3.1.0