Update capybara to version 3.11.1

Gemfile.lock

@@ -88,13 +88,14 @@ GEM
     builder (3.2.3)
     byebug (10.0.2)
     cancancan (2.3.0)
-    capybara (2.6.2)
+    capybara (3.11.1)
       addressable
-      mime-types (>= 1.16)
-      nokogiri (>= 1.3.3)
-      rack (>= 1.0.0)
-      rack-test (>= 0.5.4)
-      xpath (~> 2.0)
+      mini_mime (>= 0.1.3)
+      nokogiri (~> 1.8)
+      rack (>= 1.6.0)
+      rack-test (>= 0.6.3)
+      regexp_parser (~> 1.2)
+      xpath (~> 3.2)
     carrierwave (1.2.3)
       activemodel (>= 4.0.0)
       activesupport (>= 4.0.0)
@@ -438,6 +439,7 @@ GEM
     recaptcha (4.13.0)
       json
     redcarpet (3.4.0)
+    regexp_parser (1.3.0)
     request_store (1.4.1)
       rack (>= 1.4)
     responders (2.4.0)
@@ -583,8 +585,8 @@ GEM
     websocket-extensions (0.1.3)
     whenever (0.10.0)
       chronic (>= 0.6.3)
-    xpath (2.0.0)
-      nokogiri (~> 1.3)
+    xpath (3.2.0)
+      nokogiri (~> 1.8)
     yajl-ruby (1.4.1)
 
 PLATFORMS