Fix lint warnings

Author: Peter Kieltyka

.travis.yml

@@ -4,7 +4,6 @@ go:
   - 1.7.x
   - 1.8.x
   - 1.9.x
-  - tip
 
 install:
   - go get -u golang.org/x/tools/cmd/goimports

middleware/get_head.go

@@ -6,6 +6,7 @@ import (
 	"github.com/go-chi/chi"
 )
 
+// GetHead automatically route undefined HEAD requests to GET handlers.
 func GetHead(next http.Handler) http.Handler {
 	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
 		if r.Method == "HEAD" {

tree.go

@@ -29,7 +29,7 @@ const (
 	mTRACE
 )
 
-var mALL methodTyp = mCONNECT | mDELETE | mGET | mHEAD |
+var mALL = mCONNECT | mDELETE | mGET | mHEAD |
 	mOPTIONS | mPATCH | mPOST | mPUT | mTRACE
 
 var methodMap = map[string]methodTyp{
@@ -44,6 +44,8 @@ var methodMap = map[string]methodTyp{
 	"TRACE":   mTRACE,
 }
 
+// RegisterMethod adds support for custom HTTP method handlers, available
+// via Router#Method and Router#MethodFunc
 func RegisterMethod(method string) {
 	if method == "" {
 		return