EOL Rails 5.0 and Rails 5.1

Being we no longer run automated tests against these versions of Rails
this removes support for them in the gem.

Dropping support for Rails 5.0 also allows us to bump
`rspec-rails` to be using `4.0.0` at minimum.

Author: keegnotrub

CHANGELOG.md

@@ -6,6 +6,7 @@
 
 - Remove support for EOL'd Rails version 4.2
 - Remove support for Travis CI and replaced with Github Actions
+- Remove support for EOL'd Rails versions 5.0 and 5.1
 
 ## [3.1.2] - 2019-05-20
 

Gemfile.lock

@@ -43,11 +43,11 @@ GEM
     coderay (1.1.3)
     concurrent-ruby (1.1.7)
     crass (1.0.6)
-    diff-lcs (1.4.4)
-    erubi (1.9.0)
+    diff-lcs (1.5.0)
+    erubi (1.12.0)
     i18n (1.8.5)
       concurrent-ruby (~> 1.0)
-    loofah (2.7.0)
+    loofah (2.19.1)
       crass (~> 1.0.2)
       nokogiri (>= 1.5.9)
     method_source (1.0.0)
@@ -66,8 +66,8 @@ GEM
     rails-dom-testing (2.0.3)
       activesupport (>= 4.2.0)
       nokogiri (>= 1.6)
-    rails-html-sanitizer (1.3.0)
-      loofah (~> 2.3)
+    rails-html-sanitizer (1.5.0)
+      loofah (~> 2.19, >= 2.19.1)
     railties (6.0.3.3)
       actionpack (= 6.0.3.3)
       activesupport (= 6.0.3.3)
@@ -76,23 +76,23 @@ GEM
       thor (>= 0.20.3, < 2.0)
     rake (13.0.1)
     regexp_parser (1.8.1)
-    rspec-core (3.9.3)
-      rspec-support (~> 3.9.3)
-    rspec-expectations (3.9.2)
+    rspec-core (3.12.1)
+      rspec-support (~> 3.12.0)
+    rspec-expectations (3.12.2)
       diff-lcs (>= 1.2.0, < 2.0)
-      rspec-support (~> 3.9.0)
-    rspec-mocks (3.9.1)
+      rspec-support (~> 3.12.0)
+    rspec-mocks (3.12.4)
       diff-lcs (>= 1.2.0, < 2.0)
-      rspec-support (~> 3.9.0)
-    rspec-rails (3.9.1)
-      actionpack (>= 3.0)
-      activesupport (>= 3.0)
-      railties (>= 3.0)
-      rspec-core (~> 3.9.0)
-      rspec-expectations (~> 3.9.0)
-      rspec-mocks (~> 3.9.0)
-      rspec-support (~> 3.9.0)
-    rspec-support (3.9.3)
+      rspec-support (~> 3.12.0)
+    rspec-rails (4.0.2)
+      actionpack (>= 4.2)
+      activesupport (>= 4.2)
+      railties (>= 4.2)
+      rspec-core (~> 3.10)
+      rspec-expectations (~> 3.10)
+      rspec-mocks (~> 3.10)
+      rspec-support (~> 3.10)
+    rspec-support (3.12.0)
     thor (1.0.1)
     thread_safe (0.3.6)
     tzinfo (1.2.7)
@@ -105,12 +105,12 @@ PLATFORMS
   ruby
 
 DEPENDENCIES
-  activesupport (>= 5.0)
+  activesupport (>= 5.2)
   appraisal
   capybara
   high_voltage!
   pry
-  rspec-rails (~> 3.5)
+  rspec-rails (~> 4.0.0)
 
 BUNDLED WITH
-   2.1.2
+   2.2.33

high_voltage.gemspec

@@ -21,9 +21,9 @@ Gem::Specification.new do |s|
   s.test_files    = []
   s.require_paths = ["lib"]
 
-  s.add_development_dependency('activesupport', '>= 5.0')
+  s.add_development_dependency('activesupport', '>= 5.2')
   s.add_development_dependency('appraisal')
   s.add_development_dependency('capybara')
   s.add_development_dependency('pry')
-  s.add_development_dependency('rspec-rails', '~> 3.5')
+  s.add_development_dependency('rspec-rails', '~> 4.0.0')
 end