minor fixes. see v4.0.1...v4.0.2

Fixes issue with compress middleware: #382 #385

• 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 v3.3.4...v4.0.0

Minor middleware improvements. No changes to core library/router. Moving v3 into its own branch as a version of chi for Go 1.7, 1.8, 1.9, 1.10, 1.11

History of changes: v3.3.3...v3.3.4

Master will switch into v4, where we will only support Go versions inline with Go's own policy, https://golang.org/doc/devel/release.html#policy (aka, last 2 versions)

Minor release.
Changelog: v3.3.2...v3.3.3

• Support to route trailing slashes on mounted sub-routers (#281)
• middleware: new ContentCharset to check matching charsets. Thank you @csucu for your community contribution!

• middleware: new AllowContentType handler for explicit whitelist of accepted request Content-Types
• middleware: new SetHeader handler for short-hand middleware to set a response header key/value
• Minor bug fixes

• New chi.RegisterMethod(method) to add support for custom HTTP methods, see _examples/custom-method for usage
• Deprecated LINK and UNLINK methods from the default list, please use chi.RegisterMethod("LINK") and chi.RegisterMethod("UNLINK") in an init() function

• Fix a few minor issues after v3 release
• Move docgen sub-pkg to https://github.com/go-chi/docgen
• Move render sub-pkg to https://github.com/go-chi/render
• Add new URLFormat handler to chi/middleware sub-pkg to make working with url mime
  suffixes easier, ie. parsing /articles/1.json and /articles/1.xml. See comments in
  https://github.com/go-chi/chi/blob/master/middleware/url_format.go for example usage.