New version

Gemfile

@@ -2,22 +2,16 @@
 # the following line to use "http://" instead
 source 'https://rubygems.org'
 
-gem "middleman", "~>3.4.0"
+gem 'middleman', '~>3.4.0'
 
 # Live-reloading plugin
-gem "middleman-livereload", "~> 3.1.0"
-
-# For faster file watcher updates on Windows:
-gem "wdm", "~> 0.1.0", :platforms => [:mswin, :mingw]
-
-# Windows does not come with time zone data
-gem "tzinfo-data", platforms: [:mswin, :mingw, :jruby]
+gem 'middleman-livereload'
 
 gem 'bootstrap-sass', require: false
 gem 'jquery-middleman'
 gem 'sass'
 gem 'bourbon'
-gem 'haml'
+gem 'slim'
 gem 'coffee-script'
 
 gem 'middleman-deploy'