iiif_url.gemspec in iiif_url-0.0.2 vs iiif_url.gemspec in iiif_url-0.0.3

@@ -21,6 +21,7 @@
 
   spec.add_development_dependency "bundler", "~> 1.11"
   spec.add_development_dependency "rake", "~> 10.0"
   spec.add_development_dependency "minitest", "~> 5.0"
   spec.add_development_dependency "colorize"
+  spec.add_development_dependency "simplecov"
 end