update dependencies

Gemfile.lock

@@ -1,16 +1,16 @@
 GEM
   remote: https://rubygems.org/
   specs:
-    addressable (2.3.6)
-    css_parser (1.3.5)
+    addressable (2.3.8)
+    css_parser (1.3.6)
       addressable
-    htmlentities (4.3.3)
+    htmlentities (4.3.4)
     mail (2.6.3)
       mime-types (>= 1.16, < 3)
-    mime-types (2.4.3)
+    mime-types (2.6.1)
     mini_portile (0.6.2)
-    minitest (5.5.0)
-    nokogiri (1.6.5)
+    minitest (5.8.0)
+    nokogiri (1.6.6.2)
       mini_portile (~> 0.6.0)
     pakyow (0.9.1)
       bundler (~> 1.5)
@@ -35,15 +35,15 @@ GEM
       pakyow-core (= 0.9.1)
       pakyow-presenter (= 0.9.1)
     pakyow-support (0.9.1)
-    premailer (1.8.2)
-      css_parser (>= 1.3.5)
+    premailer (1.8.4)
+      css_parser (>= 1.3.6)
       htmlentities (>= 4.0.0)
-    rack (1.6.0)
+    rack (1.6.4)
     rake (10.4.2)
-    slim (3.0.1)
+    slim (3.0.6)
       temple (~> 0.7.3)
       tilt (>= 1.3.3, < 2.1)
-    temple (0.7.4)
+    temple (0.7.6)
     tilt (2.0.1)
 
 PLATFORMS
@@ -54,3 +54,6 @@ DEPENDENCIES
   pakyow (~> 0.9)
   rake
   slim (~> 3.0)
+
+BUNDLED WITH
+   1.10.6

pakyow-slim.gemspec

@@ -18,8 +18,11 @@ Gem::Specification.new do |s|
                         File.join(presenter_path, 'VERSION'),
                         File.join(presenter_path, 'lib','*')
                       ]
+
   s.add_dependency('pakyow-core', '~> 0.9')
   s.add_dependency('pakyow-presenter', '~> 0.9')
   s.add_dependency('slim', '~> 3.0')
-  s.add_dependency('ruby', '~> 2.0')
+
+  s.add_development_dependency('rake', '~> 10.4')
+  s.add_development_dependency('minitest', '~> 5.8')
 end