Add \n after post-install output

treat.gemspec

@@ -3,7 +3,7 @@ $:.push File.expand_path('../lib', __FILE__)
 require 'treat/version'
 
 Gem::Specification.new do |s|
-  
+
   s.name        = 'treat'
   s.version     = Treat::VERSION
   s.authors     = ['Louis Mullie']
@@ -11,30 +11,31 @@ Gem::Specification.new do |s|
   s.homepage    = 'https://github.com/louismullie/treat'
   s.summary     = %q{ Text Retrieval, Extraction and Annotation Toolkit. }
   s.description = %q{ Treat is a natural language processing framework for Ruby. }
-  
+
   # Add all files.
-  s.files = 
-  Dir['bin/**/*'] + 
-  Dir['lib/**/*'] + 
+  s.files =
+  Dir['bin/**/*'] +
+  Dir['lib/**/*'] +
   Dir['spec/**/*'] +
-  Dir['models/**/*'] +  
-  Dir['tmp/**/*'] + 
+  Dir['models/**/*'] +
+  Dir['tmp/**/*'] +
   Dir['files/**/*'] +
   ['README.md', 'LICENSE']
-  
+
   # Runtime dependencies
   s.add_runtime_dependency 'schiphol'
   s.add_runtime_dependency 'birch'
   s.add_runtime_dependency 'yomu'
-  
+
   # Development dependencies
   s.add_development_dependency 'rspec'
   s.add_development_dependency 'rake'
   s.add_development_dependency 'simplecov'
-  
+
   # Post-install message
   s.post_install_message = %q{Thanks for installing Treat.
-  To complete the installation, run `require 'treat'` in an IRB 
-  terminal, followed by `Treat::Core::Installer.install`. }
+  To complete the installation, run `require 'treat'` in an IRB
+  terminal, followed by `Treat::Core::Installer.install`.
+  }
 
 end