Bump capybara from 2.18.0 to 3.6.0 (#527) [ci skip]

Bumps [capybara](https://github.com/teamcapybara/capybara) from 2.18.0 to 3.6.0.
- [Release notes](https://github.com/teamcapybara/capybara/releases)
- [Changelog](https://github.com/teamcapybara/capybara/blob/master/History.md)
- [Commits](https://github.com/teamcapybara/capybara/compare/2.18.0...3.6.0)

Signed-off-by: dependabot[bot] <support@dependabot.com>

Gemfile

@@ -113,7 +113,7 @@ end
 
 group :development, :test do
   gem "byebug", "~> 8.2"
-  gem "capybara", "~> 2.18"
+  gem "capybara", "~> 3.6"
   gem "derailed", "~> 0.1"
   gem "faker", git: "https://github.com/stympy/faker.git", branch: "master"
   gem "fix-db-schema-conflicts", github: "thepracticaldev/fix-db-schema-conflicts", branch: "master"

Gemfile.lock

@@ -165,13 +165,13 @@ GEM
       bundler (~> 1.2)
       thor (~> 0.18)
     byebug (8.2.5)
-    capybara (2.18.0)
+    capybara (3.6.0)
       addressable
       mini_mime (>= 0.1.3)
-      nokogiri (>= 1.3.3)
-      rack (>= 1.0.0)
-      rack-test (>= 0.5.4)
-      xpath (>= 2.0, < 4.0)
+      nokogiri (~> 1.8)
+      rack (>= 1.6.0)
+      rack-test (>= 0.6.3)
+      xpath (~> 3.1)
     carrierwave (1.2.2)
       activemodel (>= 4.0.0)
       activesupport (>= 4.0.0)
@@ -564,7 +564,7 @@ GEM
     mime-types (3.1)
       mime-types-data (~> 3.2015)
     mime-types-data (3.2016.0521)
-    mini_mime (1.0.0)
+    mini_mime (1.0.1)
     mini_portile2 (2.3.0)
     minitest (5.11.3)
     momentjs-rails (2.17.1)
@@ -622,7 +622,7 @@ GEM
       method_source (~> 0.9.0)
     pry-rails (0.3.6)
       pry (>= 0.10.4)
-    public_suffix (3.0.2)
+    public_suffix (3.0.3)
     puma (3.11.2)
     puma_worker_killer (0.1.0)
       get_process_mem (~> 0.2)
@@ -932,7 +932,7 @@ DEPENDENCIES
   bullet (~> 5.7)
   bundler-audit (~> 0.6)
   byebug (~> 8.2)
-  capybara (~> 2.18)
+  capybara (~> 3.6)
   carrierwave (~> 1.2)
   carrierwave-bombshelter (~> 0.2)
   chromedriver-helper (~> 1.2)