Finish 2.2.0

Author: gkellogg

VERSION

@@ -1 +1 @@
-2.2.0-rc1
+2.2.0

rdf-spec.gemspec

@@ -27,7 +27,7 @@ Gem::Specification.new do |gem|
 
   gem.required_ruby_version      = '>= 2.2.2'
   gem.requirements               = []
-  gem.add_runtime_dependency     'rdf',             '~> 2.1'
+  gem.add_runtime_dependency     'rdf',             '~> 2.2'
   gem.add_runtime_dependency     'rdf-isomorphic',  '~> 2.0'
   gem.add_runtime_dependency     'rspec',           '~> 3.5'
   gem.add_runtime_dependency     'rspec-its',       '~> 1.0'