Upgraded rspec gem; Added puma gem

Gemfile

@@ -42,6 +42,7 @@ group :development, :test, :mysql do
   gem 'database_cleaner'
   gem 'poltergeist'
   gem 'rspec-rails'
+  gem 'puma'
   gem 'test-unit'
 end
 

Gemfile.lock

@@ -197,6 +197,7 @@ GEM
     pry-rails (0.3.6)
       pry (>= 0.10.4)
     public_suffix (3.0.0)
+    puma (3.10.0)
     rack (2.0.3)
     rack-livereload (0.3.16)
       rack
@@ -235,27 +236,27 @@ GEM
     responders (2.4.0)
       actionpack (>= 4.2.0, < 5.3)
       railties (>= 4.2.0, < 5.3)
-    rspec (3.6.0)
+    rspec (3.7.0)
-      rspec-core (~> 3.6.0)
+      rspec-core (~> 3.7.0)
-      rspec-expectations (~> 3.6.0)
+      rspec-expectations (~> 3.7.0)
-      rspec-mocks (~> 3.6.0)
+      rspec-mocks (~> 3.7.0)
-    rspec-core (3.6.0)
+    rspec-core (3.7.0)
-      rspec-support (~> 3.6.0)
+      rspec-support (~> 3.7.0)
-    rspec-expectations (3.6.0)
+    rspec-expectations (3.7.0)
       diff-lcs (>= 1.2.0, < 2.0)
-      rspec-support (~> 3.6.0)
+      rspec-support (~> 3.7.0)
-    rspec-mocks (3.6.0)
+    rspec-mocks (3.7.0)
       diff-lcs (>= 1.2.0, < 2.0)
-      rspec-support (~> 3.6.0)
+      rspec-support (~> 3.7.0)
-    rspec-rails (3.6.1)
+    rspec-rails (3.7.0)
       actionpack (>= 3.0)
       activesupport (>= 3.0)
       railties (>= 3.0)
-      rspec-core (~> 3.6.0)
+      rspec-core (~> 3.7.0)
-      rspec-expectations (~> 3.6.0)
+      rspec-expectations (~> 3.7.0)
-      rspec-mocks (~> 3.6.0)
+      rspec-mocks (~> 3.7.0)
-      rspec-support (~> 3.6.0)
+      rspec-support (~> 3.7.0)
-    rspec-support (3.6.0)
+    rspec-support (3.7.0)
     ruby-prof (0.16.2)
     ruby_dep (1.5.0)
     sass (3.5.2)
@@ -338,6 +339,7 @@ DEPENDENCIES
   powder
   pry
   pry-rails
+  puma
   rack-livereload
   rails (= 5.1.4)
   rails-perftest