Add openSUSE prerequisite instructions

These instructions were tested on openSUSE Tumbleweed and openSUSE Leap
15.1. There are some modules left that are not documented yet, but this
already improves the sitution for common openSUSE users.

modules/lang/go/README.org

@@ -4,15 +4,15 @@
 #+STARTUP: inlineimages
 
 * Table of Contents :TOC:
-- [[Description][Description]]
-  - [[Module Flags][Module Flags]]
-  - [[Plugins][Plugins]]
-- [[Prerequisites][Prerequisites]]
-  - [[Go][Go]]
-  - [[Dependencies][Dependencies]]
-- [[Features][Features]]
-- [[Configuration][Configuration]]
-- [[Troubleshooting][Troubleshooting]]
+- [[#description][Description]]
+  - [[#module-flags][Module Flags]]
+  - [[#plugins][Plugins]]
+- [[#prerequisites][Prerequisites]]
+  - [[#go][Go]]
+  - [[#dependencies][Dependencies]]
+- [[#features][Features]]
+- [[#configuration][Configuration]]
+- [[#troubleshooting][Troubleshooting]]
 
 * Description
 This module adds [[https://golang.org][Go]] support.
@@ -51,6 +51,11 @@ brew install go
 sudo pacman -S go
 #+END_SRC
 
+*** openSUSE
+#+BEGIN_SRC sh :dir /sudo::
+sudo zypper install go
+#+END_SRC
+
 ** Dependencies
 This module requires a valid ~GOPATH~, and the following Go packages: