Update gemspec.

Gemfile.lock

@@ -4,7 +4,7 @@ PATH
     google_visualr (2.1.7)
 
 GEM
-  remote: http://rubygems.org/
+  remote: https://rubygems.org/
   specs:
     actionmailer (3.2.8)
       actionpack (= 3.2.8)
@@ -35,7 +35,7 @@ GEM
       multi_json (~> 1.0)
     arel (3.0.2)
     builder (3.0.3)
-    diff-lcs (1.1.3)
+    diff-lcs (1.2.4)
     erubis (2.7.0)
     hike (1.2.1)
     i18n (0.6.1)
@@ -73,14 +73,14 @@ GEM
     rake (0.9.2.2)
     rdoc (3.12)
       json (~> 1.4)
-    rspec (2.11.0)
-      rspec-core (~> 2.11.0)
-      rspec-expectations (~> 2.11.0)
-      rspec-mocks (~> 2.11.0)
-    rspec-core (2.11.1)
-    rspec-expectations (2.11.3)
-      diff-lcs (~> 1.1.3)
-    rspec-mocks (2.11.3)
+    rspec (2.14.1)
+      rspec-core (~> 2.14.0)
+      rspec-expectations (~> 2.14.0)
+      rspec-mocks (~> 2.14.0)
+    rspec-core (2.14.5)
+    rspec-expectations (2.14.2)
+      diff-lcs (>= 1.1.3, < 2.0)
+    rspec-mocks (2.14.3)
     sprockets (2.1.3)
       hike (~> 1.2)
       rack (~> 1.0)
@@ -96,7 +96,7 @@ PLATFORMS
   ruby
 
 DEPENDENCIES
-  bundler (>= 1.1.5)
+  bundler (>= 1.3.5)
   google_visualr!
-  rails (>= 3.2.8)
-  rspec (>= 2.11.0)
+  rails (>= 3.2)
+  rspec (>= 2.14.1)

google_visualr.gemspec

@@ -1,25 +1,21 @@
-# -*- encoding: utf-8 -*-
-require File.expand_path("../lib/google_visualr/version", __FILE__)
+$:.push File.expand_path("../lib", __FILE__)
+
+# Maintain your gem's version:
+require "google_visualr/version"
 
 Gem::Specification.new do |s|
   s.name        = "google_visualr"
   s.version     = GoogleVisualr::VERSION
-  s.platform    = Gem::Platform::RUBY
   s.authors     = ["Winston Teo"]
   s.email       = ["winston.yongwei+google_visualr@gmail.com"]
   s.homepage    = "https://github.com/winston/google_visualr"
   s.summary     = "A Ruby wrapper around the Google Chart Tools that allows anyone to create the same beautiful charts with just plain Ruby."
   s.description = "This Ruby gem, GoogleVisualr, is a wrapper around the Google Chart Tools that allows anyone to create the same beautiful charts with just Ruby; you don't have to write any JavaScript at all."
-  s.extra_rdoc_files = ["README.rdoc"]
-
-  s.required_rubygems_version = ">= 1.3.6"
-  s.rubyforge_project         = "google_visualr"
 
-  s.add_development_dependency "bundler", ">= 1.1.5"
-  s.add_development_dependency "rspec"  , ">= 2.11.0"
-  s.add_development_dependency "rails"  , ">= 3.2.8"
+  s.files = Dir["{app,config,db,lib}/**/*"] + ["MIT-LICENSE", "Rakefile", "README.rdoc"]
+  s.test_files = Dir["spec/**/*"]
 
-  s.files        = `git ls-files`.split("\n")
-  s.executables  = `git ls-files`.split("\n").map{|f| f =~ /^bin\/(.*)/ ? $1 : nil}.compact
-  s.require_path = 'lib'
+  s.add_development_dependency "bundler", ">= 1.3.5"
+  s.add_development_dependency "rspec"  , ">= 2.14.1"
+  s.add_development_dependency "rails"  , ">= 3.2"
 end