Improve table of contents;

doc/README.md

@@ -1,9 +1,6 @@
 RxLua
 ===
 
-Table of Contents
----
-
 - [Observer](#observer)
   - [create](#createonnext-onerror-oncomplete)
   - [onNext](#onnextvalues)

tools/update_documentation.lua

@@ -3,7 +3,6 @@ local docroc = require 'tools/docroc'
 io.output('doc/README.md')
 
 io.write('RxLua\n===\n\n')
-io.write('Table of Contents\n---\n\n')
 
 local comments = docroc.process('rx.lua')