Release version 2.0.0 and print upgrade notice.

This new version drops built-in filtering of /assets, and leaves
all paths to be excluded from maintenance to be configured by
the user.

UPGRADING

@@ -0,0 +1,14 @@
+
+******** Rack::Maintenance 2.0.0 *********
+
+Rack::Maintenance 2.0.0 has dropped the built-in filter for /assets.
+This means that all your paths will now be blocked in maintenance
+mode, unless you exclude them in the configuration.
+
+To bring back pre-2.0.0 behaviour, configure the gem like so:
+
+config.middleware.use 'Rack::Maintenance',
+  file: Rails.root.join("public", "maintenance.html"),
+  without: /\A\/assets/
+
+

lib/rack/maintenance/version.rb

@@ -1,5 +1,5 @@
 module Rack
   class Maintenance
-    VERSION = "1.2.0"
+    VERSION = "2.0.0"
   end
 end

rack-maintenance.gemspec

@@ -11,6 +11,7 @@ Gem::Specification.new do |s|
   s.homepage      = "http://github.com/tilsammans/rack-maintenance"
   s.summary       = "Detect and show a maintenance page"
   s.description   = "Detect and show a maintenance page"
+  s.post_install_message = File.read("UPGRADING")
 
   s.files         = Dir["{app,config,db,lib}/**/*"] + ["LICENSE", "Rakefile", "README.rdoc"]
   s.test_files    = Dir["spec/**/*"]