Update TOC to match README

[ci skip]

Author: gjrtimmer

README.md

@@ -24,10 +24,9 @@ Supported Golang version:
   - [Android](#android)
   - [ARM](#arm)
   - [Cross Compile](#cross-compile)
-  - [Docker](#docker)
-    - [Alpine](#alpine)
   - [Google Cloud Platform](#google-cloud-platform)
   - [Linux](#linux)
+    - [Alpine](#alpine)
     - [Fedora](#fedora)
     - [Ubuntu](#ubuntu)
   - [Mac OSX](#mac-osx)