Merge pull request #111 from shawnps/patch-2

fix typo

protoc-gen-grpc-gateway/descriptor/types.go

@@ -19,7 +19,7 @@ type GoPackage struct {
 	Alias string
 }
 
-// Standard returns whether the import is a golang standard pacakge.
+// Standard returns whether the import is a golang standard package.
 func (p GoPackage) Standard() bool {
 	return !strings.Contains(p.Path, ".")
 }