middleman-webp.gemspec in middleman-webp-0.4.3 vs middleman-webp.gemspec in middleman-webp-1.0.0

@@ -17,11 +17,12 @@
   spec.executables   = spec.files.grep(%r{^bin/}) { |f| File.basename(f) }
   spec.test_files    = spec.files.grep(%r{^(test|spec|features)/})
   spec.require_paths = ["lib"]
 
   spec.add_dependency "middleman-core", "~> 4.0"
+  spec.add_dependency "shell", "~> 0.8.1"
 
-  spec.add_development_dependency "bundler", "~> 1.5"
+  spec.add_development_dependency "bundler", ">= 1.5"
   spec.add_development_dependency "middleman-cli", "~> 4.0.0"
   spec.add_development_dependency "rake"
   #spec.add_development_dependency "simplecov"
   spec.add_development_dependency "mocha"
 end