Bump the Rake development dependency.

Avoids this issue: ruby/rake#128

Author: Alistair McKinnell

fix-db-schema-conflicts.gemspec

@@ -19,7 +19,7 @@ Gem::Specification.new do |spec|
   spec.require_paths = ['lib']
 
   spec.add_development_dependency 'bundler', '~> 1.6'
-  spec.add_development_dependency 'rake', '~> 11.1.1'
+  spec.add_development_dependency 'rake', '~> 11.2.0'
   spec.add_development_dependency 'rspec', '~>3.4.0'
   spec.add_development_dependency 'rails', '~> 4.2.0'
   spec.add_development_dependency 'sqlite3', '~> 1.3.0'