fixed version problem with nokogiri mentioned in #1

Gemfile

@@ -8,4 +8,4 @@ gem 'middleman-autoprefixer', '~> 2.7.0'
 gem "middleman-sprockets", "~> 4.1.0"
 gem 'rouge', '~> 2.0.5'
 gem 'redcarpet', '~> 3.4.0'
-gem 'nokogiri', '~> 1.6.8'
+gem 'nokogiri', '~> 1.8.2'

Gemfile.lock

@@ -26,6 +26,7 @@ GEM
     fastimage (2.0.1)
       addressable (~> 2)
     ffi (1.9.17)
+    ffi (1.9.17-x64-mingw32)
     haml (4.0.7)
       tilt
     hamster (3.0.0)
@@ -79,10 +80,12 @@ GEM
     middleman-syntax (3.0.0)
       middleman-core (>= 3.2)
       rouge (~> 2.0)
-    mini_portile2 (2.1.0)
+    mini_portile2 (2.3.0)
     minitest (5.10.1)
-    nokogiri (1.6.8.1)
-      mini_portile2 (~> 2.1.0)
+    nokogiri (1.8.2)
+      mini_portile2 (~> 2.3.0)
+    nokogiri (1.8.2-x64-mingw32)
+      mini_portile2 (~> 2.3.0)
     padrino-helpers (0.13.3.3)
       i18n (~> 0.6, >= 0.6.7)
       padrino-support (= 0.13.3.3)
@@ -112,18 +115,19 @@ GEM
 
 PLATFORMS
   ruby
+  x64-mingw32
 
 DEPENDENCIES
   middleman (~> 4.2.1)
   middleman-autoprefixer (~> 2.7.0)
   middleman-sprockets (~> 4.1.0)
   middleman-syntax (~> 3.0.0)
-  nokogiri (~> 1.6.8)
+  nokogiri (~> 1.8.2)
   redcarpet (~> 3.4.0)
   rouge (~> 2.0.5)
 
 RUBY VERSION
    ruby 2.3.3p222
 
 BUNDLED WITH
-   1.16.0
+   1.16.1