Bump spring from 2.0.2 to 2.1.1

Bumps [spring](https://github.com/rails/spring) from 2.0.2 to 2.1.1.
- [Release notes](https://github.com/rails/spring/releases)
- [Changelog](https://github.com/rails/spring/blob/master/CHANGELOG.md)
- [Commits](https://github.com/rails/spring/compare/v2.0.2...v2.1.1)

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

Gemfile

@@ -78,7 +78,7 @@ group :development, :test do
   gem "knapsack_pro", "~> 2.6.0"
   gem "launchy", "~> 2.5.0"
   gem "letter_opener_web", "~> 1.4.0"
-  gem "spring", "~> 2.0.1"
+  gem "spring", "~> 2.1.1"
   gem "spring-commands-rspec", "~> 1.0.4"
 end
 

Gemfile.lock

@@ -550,8 +550,7 @@ GEM
     social-share-button (1.1.0)
       coffee-rails
     socksify (1.7.1)
-    spring (2.0.2)
-      activesupport (>= 4.2)
+    spring (2.1.1)
     spring-commands-rspec (1.0.4)
       spring (>= 0.9.1)
     sprockets (3.7.2)
@@ -713,7 +712,7 @@ DEPENDENCIES
   selenium-webdriver (~> 3.142)
   sitemap_generator (~> 6.0.2)
   social-share-button (~> 1.1)
-  spring (~> 2.0.1)
+  spring (~> 2.1.1)
   spring-commands-rspec (~> 1.0.4)
   sprockets (~> 3.7.2)
   translator-text (~> 0.1.0)