update README with installation instructions and supported versions.

Author: ikirudennis

README.textile

@@ -2,9 +2,11 @@ h1. python-textile
 
 python-textile is a Python port of Textile, Dean Allen's humane web text generator.
 
-h2. Usage
+h2. Installation
+
+Install the 'textile' folder on your python path, or @pip install textile@
 
-Install the 'textile' folder on your python path, or @pip install https://github.com/ikirudennis/python-textile/archive/v2.1.8.tar.gz@
+h2. Usage
 
 <pre>
 <code>
@@ -34,4 +36,4 @@ Install the 'textile' folder on your python path, or @pip install https://github
 
 h3. Notes:
 
-* Active development supports Python 2.6 or later (including Python 3.3+).
+* Active development supports Python 2.6 or later (including Python 3.2+).