v1.5 release with go.mod support (go-chi#560)

Release v1.5.0 with go.mod file, based from prior v4.1.2 without go.mod

Release v4.1.2

Release v4.1.1

Release v4.1.0

Release v4.0.4

Update CHANGELOG, release v4.0.3

add go 1.12 to ci

middleware: fix Compress to return passed down status code

release v4.0.0