Update gem dependencies

Gemfile.lock

@@ -1,24 +1,24 @@
 GEM
   remote: https://rubygems.org/
   specs:
-    activesupport (4.2.5.1)
+    activesupport (4.2.5.2)
       i18n (~> 0.7)
       json (~> 1.7, >= 1.7.7)
       minitest (~> 5.1)
       thread_safe (~> 0.3, >= 0.3.4)
       tzinfo (~> 1.1)
-    backports (3.6.7)
+    backports (3.6.8)
     better_errors (2.1.1)
       coderay (>= 1.0.0)
       erubis (>= 2.6.6)
       rack (>= 0.9.0)
-    browser (1.1.0)
-    coderay (1.1.0)
+    browser (2.0.2)
+    coderay (1.1.1)
     coffee-script (2.4.1)
       coffee-script-source
       execjs
     coffee-script-source (1.10.0)
-    concurrent-ruby (1.0.0)
+    concurrent-ruby (1.0.1)
     daemons (1.2.3)
     erubis (2.7.0)
     ethon (0.8.1)
@@ -78,11 +78,11 @@ GEM
     thor (0.19.1)
     thread_safe (0.3.5)
     tilt (2.0.2)
-    tty-pager (0.3.0)
-      tty-screen (~> 0.4.0)
+    tty-pager (0.4.0)
+      tty-screen (~> 0.5.0)
       tty-which (~> 0.1.0)
       verse (~> 0.4.0)
-    tty-screen (0.4.3)
+    tty-screen (0.5.0)
     tty-which (0.1.0)
     typhoeus (1.0.1)
       ethon (>= 0.8.0)

lib/app.rb

@@ -101,7 +101,7 @@ class App < Sinatra::Application
     include Sprockets::Helpers
 
     def browser
-      @browser ||= Browser.new ua: request.user_agent
+      @browser ||= Browser.new(request.user_agent)
     end
 
     UNSUPPORTED_IE_VERSIONS = %w(6 7 8 9).freeze