message: Add link to Go HOW-TO.
  Merge into
diff: @@ -109,6 +109,7 @@ AEAD primitive in Java:
  * [Java HOW-TO](docs/JAVA-HOWTO.md)
  * [C++ HOW-TO](docs/CPP-HOWTO.md)
  * [Obj-C HOW-TO](docs/OBJC-HOWTO.md)
  +* [Go HOW-TO](docs/GOLANG-HOWTO.md)
  * [Security and Usability Design Goals](docs/SECURITY-USABILITY.md)
  * [Supported Crypto Primitives](docs/PRIMITIVES.md)
  * [Key Management](docs/KEY-MANAGEMENT.md)
  