Merge pull request #27488 from tarcieri/upgrade-nio4r-to-2-0

Upgrade to nio4r 2.0.0

Gemfile.lock

@@ -54,7 +54,7 @@ PATH
   specs:
     actioncable (5.1.0.alpha)
       actionpack (= 5.1.0.alpha)
-      nio4r (~> 1.2)
+      nio4r (~> 2.0)
       websocket-driver (~> 0.6.1)
     actionmailer (5.1.0.alpha)
       actionpack (= 5.1.0.alpha)
@@ -231,7 +231,7 @@ GEM
     mysql2 (0.4.5)
     mysql2 (0.4.5-x64-mingw32)
     mysql2 (0.4.5-x86-mingw32)
-    nio4r (1.2.1)
+    nio4r (2.0.0)
     nokogiri (1.7.0)
       mini_portile2 (~> 2.1.0)
     nokogiri (1.7.0-x64-mingw32)

actioncable/actioncable.gemspec

@@ -20,6 +20,6 @@
 
   s.add_dependency "actionpack", version
 
-  s.add_dependency "nio4r",            "~> 1.2"
+  s.add_dependency "nio4r",            "~> 2.0"
   s.add_dependency "websocket-driver", "~> 0.6.1"
 end