Bump to 4.0.0 [ci skip]

CHANGELOG.md

@@ -1,4 +1,4 @@
-## 4.0.0 (Unreleased)
+## 4.0.0
 
 This major release adds JSON column support in PostgreSQL, limited support for
 versioning associations, various new configuration options, and a year's worth

README.md

@@ -66,7 +66,7 @@ The Rails 2.3 code is on the [`rails2`][11] branch and tagged `v1.x`. These bran
 
 1. Add PaperTrail to your `Gemfile`.
 
-    `gem 'paper_trail', '~> 4.0.0.rc'`
+    `gem 'paper_trail', '~> 4.0.0'`
 
 2. Generate a migration which will add a `versions` table to your database.
 
@@ -89,7 +89,7 @@ setting up your app with PaperTrail will look something like this:
 
 1. Add PaperTrail to your `Gemfile`.
 
-    `gem 'paper_trail', '~> 4.0.0.rc'`
+    `gem 'paper_trail', '~> 4.0.0'`
 
 2. Generate a migration to add a `versions` table to your database.
 

lib/paper_trail/version_number.rb

@@ -3,7 +3,7 @@ module PaperTrail
     MAJOR = 4
     MINOR = 0
     TINY  = 0
-    PRE   = 'rc2'
+    PRE   = nil
 
     STRING = [MAJOR, MINOR, TINY, PRE].compact.join('.')