Update dependencies (webmock).

(cherry picked from commit 8962423)

# Conflicts:
#	rdf-spec.gemspec

Author: gkellogg

rdf-spec.gemspec

@@ -28,9 +28,9 @@ Gem::Specification.new do |gem|
   gem.requirements               = []
   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'
-  gem.add_runtime_dependency     'webmock',         '~> 2.3'
+  gem.add_runtime_dependency     'rspec',           '~> 3.7'
+  gem.add_runtime_dependency     'rspec-its',       '~> 1.2'
+  gem.add_runtime_dependency     'webmock',         '~> 3.0'
   gem.add_development_dependency 'yard' ,           '~> 0.8'
   gem.post_install_message       = nil
 end