Bump puma from 3.11.0 to 4.1.1

Bumps [puma](https://github.com/puma/puma) from 3.11.0 to 4.1.1.
- [Release notes](https://github.com/puma/puma/releases)
- [Changelog](https://github.com/puma/puma/blob/master/History.md)
- [Commits](puma/puma@v3.11.0...v4.1.1)

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

Gemfile

@@ -11,7 +11,7 @@ gem 'rails', '~> 5.0.1'
 # Use sqlite3 as the database for Active Record
 gem 'sqlite3'
 # Use Puma as the app server
-gem 'puma', '~> 3.0'
+gem 'puma', '~> 4.1'
 # Build JSON APIs with ease. Read more: https://github.com/rails/jbuilder
 # gem 'jbuilder', '~> 2.5'
 # Use Redis adapter to run Action Cable in production

Gemfile.lock

@@ -100,7 +100,8 @@ GEM
       method_source (~> 0.9.0)
     pry-rails (0.3.6)
       pry (>= 0.10.4)
-    puma (3.11.0)
+    puma (4.1.1)
+      nio4r (~> 2.0)
     rack (2.0.3)
     rack-test (0.6.3)
       rack (>= 1.0)
@@ -197,7 +198,7 @@ DEPENDENCIES
   jwt
   listen (~> 3.0.5)
   pry-rails
-  puma (~> 3.0)
+  puma (~> 4.1)
   rails (~> 5.0.1)
   rspec-rails (~> 3.5)
   shoulda-matchers (~> 3.1)