release v4.0.0

Author: pkieltyka

CHANGELOG.md

@@ -1,12 +1,13 @@
 # Changelog
 
-## v4.0.0 (head/unreleased)
+## v4.0.0 (2019-01-10)
 
 - chi v4 requires Go 1.10.3+ (or Go 1.9.7+) - we have deprecated support for Go 1.7 and 1.8
 - router: respond with 404 on router with no routes (#362)
 - router: additional check to ensure wildcard is at the end of a url pattern (#333)
 - middleware: deprecate use of http.CloseNotifier (#347)
 - middleware: fix RedirectSlashes to include query params on redirect (#334)
+- History of changes: see https://github.com/go-chi/chi/compare/v3.3.4...v4.0.0
 
 
 ## v3.3.4 (2019-01-07)