Issue 3450 - webdrivers update.

Ran `bundle install` to update Gemfile.lock (suggestion by semaphoreci check)
Moved webdrivers gem down in the list to be in better alphabetical order (suggested by codeclimate check)

Gemfile

@@ -126,12 +126,12 @@ group :test, :development do
   gem 'letter_opener', '>= 1.4.1'
   gem 'timecop'
   gem 'selenium-webdriver'
-  gem 'webdrivers', '3.8.1'
   gem 'rspec-retry'
   gem 'json_spec', '~> 1.1.4'
   gem 'unicorn-rails'
   gem 'atomic'
   gem 'knapsack'
+  gem 'webdrivers', '3.8.1'
 end
 
 group :test do

Gemfile.lock

@@ -179,8 +179,6 @@ GEM
       tilt
     angularjs-file-upload-rails (2.4.1)
     angularjs-rails (1.5.5)
-    archive-zip (0.7.0)
-      io-like (~> 0.3.0)
     arel (3.0.3)
     ast (2.4.0)
     atomic (1.1.101)
@@ -211,9 +209,6 @@ GEM
       xpath (>= 2.0, < 4.0)
     childprocess (0.9.0)
       ffi (~> 1.0, >= 1.0.11)
-    chromedriver-helper (1.1.0)
-      archive-zip (~> 0.7.0)
-      nokogiri (~> 1.6)
     chronic (0.10.2)
     chunky_png (1.3.10)
     climate_control (0.2.0)
@@ -500,7 +495,6 @@ GEM
       i18n (>= 0.6.6)
     immigrant (0.3.6)
       activerecord (>= 3.0)
-    io-like (0.3.0)
     ipaddress (0.8.3)
     jaro_winkler (1.5.1)
     journey (1.0.4)
@@ -767,6 +761,10 @@ GEM
       railties (>= 3.0)
     warden (1.2.7)
       rack (>= 1.0)
+    webdrivers (3.8.1)
+      nokogiri (~> 1.6)
+      rubyzip (~> 1.0)
+      selenium-webdriver (~> 3.0)
     webmock (3.5.1)
       addressable (>= 2.3.6)
       crack (>= 0.3.2)
@@ -797,7 +795,6 @@ DEPENDENCIES
   bugsnag
   byebug (~> 9.0.0)
   capybara (>= 2.15.4)
-  chromedriver-helper
   coffee-rails (~> 3.2.1)
   combine_pdf
   compass-rails
@@ -883,6 +880,7 @@ DEPENDENCIES
   unicorn
   unicorn-rails
   web!
+  webdrivers (= 3.8.1)
   webmock
   whenever
   wicked_pdf