bring version down to 0.8.9 and update gemspec

This way we can turn on github gem builds but publish a final
0.9.0 gem that doesn't conflict.

lib/sinatra/base.rb

@@ -4,7 +4,7 @@ require 'rack'
 require 'rack/builder'
 
 module Sinatra
-  VERSION = '0.9.0'
+  VERSION = '0.8.9'
 
   class Request < Rack::Request
     def user_agent

sinatra.gemspec

@@ -3,8 +3,8 @@ Gem::Specification.new do |s|
   s.required_rubygems_version = Gem::Requirement.new(">= 0") if s.respond_to? :required_rubygems_version=
 
   s.name = 'sinatra'
-  s.version = '0.9.0'
-  s.date = '2009-01-06'
+  s.version = '0.8.9'
+  s.date = '2009-01-13'
 
   s.description = "Classy web-development dressed in a DSL"
   s.summary     = "Classy web-development dressed in a DSL"
@@ -13,6 +13,7 @@ Gem::Specification.new do |s|
 
   # = MANIFEST =
   s.files = %w[
+    AUTHORS
     CHANGES
     LICENSE
     README.rdoc