Fix GitHub URL.

yaml.go

diff --git a/yaml.go b/yaml.go
index c0423d1..810a74c 100644
--- a/yaml.go
+++ b/yaml.go
@@ -2,7 +2,7 @@
 //
 // Source code and other details for the project are available at GitHub:
 //
-//   https://github.com/go-yaml/go-yaml-v1
+//   https://github.com/go-yaml/yaml
 //
 package yaml