Bump rake from 10.3.2 to 12.3.1

Bumps [rake](https://github.com/ruby/rake) from 10.3.2 to 12.3.1.
- [Release notes](https://github.com/ruby/rake/releases)
- [Changelog](https://github.com/ruby/rake/blob/master/History.rdoc)
- [Commits](ruby/rake@v10.3.2...v12.3.1)

Signed-off-by: dependabot[bot] <support@dependabot.com>

Gemfile

@@ -10,7 +10,7 @@ end
 group :development, :deployment do
   gem 'coffee-script', '2.4.1'
   gem 'cssminify', '1.0.2'
-  gem 'rake', '~> 10.3'
+  gem 'rake', '~> 12.3'
   gem 'therubyracer', '0.12.3'
   gem 'uglifier', '4.1.6'
 end

Gemfile.lock

@@ -14,7 +14,7 @@ GEM
     rack-protection (2.0.3)
       rack
     raindrops (0.19.0)
-    rake (10.3.2)
+    rake (12.3.1)
     ref (2.0.0)
     shotgun (0.9.2)
       rack (>= 1.0)
@@ -39,7 +39,7 @@ PLATFORMS
 DEPENDENCIES
   coffee-script (= 2.4.1)
   cssminify (= 1.0.2)
-  rake (~> 10.3)
+  rake (~> 12.3)
   shotgun (= 0.9.2)
   sinatra (= 2.0.3)
   therubyracer (= 0.12.3)