Add Rubygems spec version

Gemfile.lock

@@ -6,10 +6,11 @@ PATH
 GEM
   remote: https://rubygems.org/
   specs:
-    activesupport (5.0.0)
-      concurrent-ruby (~> 1.0, >= 1.0.2)
+    activesupport (4.2.7.1)
       i18n (~> 0.7)
+      json (~> 1.7, >= 1.7.7)
       minitest (~> 5.1)
+      thread_safe (~> 0.3, >= 0.3.4)
       tzinfo (~> 1.1)
     bacon (1.2.0)
     claide (1.0.0)
@@ -45,13 +46,13 @@ GEM
       netrc (= 0.7.8)
     cocoapods-try (1.1.0)
     colored (1.2)
-    concurrent-ruby (1.0.2)
     escape (0.0.4)
     fourflusher (0.3.2)
     fuzzy_match (2.0.4)
     i18n (0.7.0)
+    json (1.8.3)
     metaclass (0.0.4)
-    minitest (5.9.0)
+    minitest (5.9.1)
     mocha (1.1.0)
       metaclass (~> 0.0.1)
     mocha-on-bacon (0.2.2)

cocoapods-amimono.gemspec

@@ -20,4 +20,9 @@ Gem::Specification.new do |spec|
 
   spec.add_development_dependency 'bundler', '~> 1.3'
   spec.add_development_dependency 'rake'
+
+  spec.rubygems_version = "1.6.2"
+  spec.required_rubygems_version = Gem::Requirement.new(">= 0") if spec.respond_to? :required_rubygems_version=
+  spec.required_ruby_version = '>= 2.0.0'
+  spec.specification_version = 3 if spec.respond_to? :specification_version
 end