up: precise dep declaration of activerecord

Gemfile.lock

@@ -2,21 +2,11 @@ PATH
   remote: .
   specs:
     rating (0.2.0)
-      rails (>= 4.2, < 6)
+      activerecord (>= 4.2, < 6)
 
 GEM
   remote: https://rubygems.org/
   specs:
-    actioncable (5.1.4)
-      actionpack (= 5.1.4)
-      nio4r (~> 2.0)
-      websocket-driver (~> 0.6.1)
-    actionmailer (5.1.4)
-      actionpack (= 5.1.4)
-      actionview (= 5.1.4)
-      activejob (= 5.1.4)
-      mail (~> 2.5, >= 2.5.4)
-      rails-dom-testing (~> 2.0)
     actionpack (5.1.4)
       actionview (= 5.1.4)
       activesupport (= 5.1.4)
@@ -30,9 +20,6 @@ GEM
       erubi (~> 1.4)
       rails-dom-testing (~> 2.0)
       rails-html-sanitizer (~> 1.0, >= 1.0.3)
-    activejob (5.1.4)
-      activesupport (= 5.1.4)
-      globalid (>= 0.3.6)
     activemodel (5.1.4)
       activesupport (= 5.1.4)
     activerecord (5.1.4)
@@ -59,20 +46,14 @@ GEM
     factory_bot_rails (4.8.2)
       factory_bot (~> 4.8.2)
       railties (>= 3.0.0)
-    globalid (0.4.1)
-      activesupport (>= 4.2.0)
     i18n (0.9.1)
       concurrent-ruby (~> 1.0)
     loofah (2.1.1)
       crass (~> 1.0.2)
       nokogiri (>= 1.5.9)
-    mail (2.7.0)
-      mini_mime (>= 0.1.1)
     method_source (0.9.0)
-    mini_mime (1.0.0)
     mini_portile2 (2.3.0)
     minitest (5.11.1)
-    nio4r (2.2.0)
     nokogiri (1.8.1)
       mini_portile2 (~> 2.3.0)
     parallel (1.12.1)
@@ -88,18 +69,6 @@ GEM
     rack (2.0.3)
     rack-test (0.8.2)
       rack (>= 1.0, < 3)
-    rails (5.1.4)
-      actioncable (= 5.1.4)
-      actionmailer (= 5.1.4)
-      actionpack (= 5.1.4)
-      actionview (= 5.1.4)
-      activejob (= 5.1.4)
-      activemodel (= 5.1.4)
-      activerecord (= 5.1.4)
-      activesupport (= 5.1.4)
-      bundler (>= 1.3.0)
-      railties (= 5.1.4)
-      sprockets-rails (>= 2.0.0)
     rails-dom-testing (2.0.3)
       activesupport (>= 4.2.0)
       nokogiri (>= 1.6)
@@ -137,27 +106,17 @@ GEM
       rainbow (>= 2.2.2, < 4.0)
       ruby-progressbar (~> 1.7)
       unicode-display_width (~> 1.0, >= 1.0.1)
-    rubocop-rspec (1.22.0)
+    rubocop-rspec (1.22.1)
       rubocop (>= 0.52.1)
     ruby-progressbar (1.9.0)
     shoulda-matchers (3.1.2)
       activesupport (>= 4.0.0)
-    sprockets (3.7.1)
-      concurrent-ruby (~> 1.0)
-      rack (> 1, < 3)
-    sprockets-rails (3.2.1)
-      actionpack (>= 4.0)
-      activesupport (>= 4.0)
-      sprockets (>= 3.0.0)
     sqlite3 (1.3.13)
     thor (0.20.0)
     thread_safe (0.3.6)
     tzinfo (1.2.4)
       thread_safe (~> 0.1)
     unicode-display_width (1.3.0)
-    websocket-driver (0.6.5)
-      websocket-extensions (>= 0.1.0)
-    websocket-extensions (0.1.3)
 
 PLATFORMS
   ruby

rating.gemspec

@@ -19,7 +19,7 @@ Gem::Specification.new do |spec|
   spec.test_files  = Dir['spec/**/*']
   spec.version     = Rating::VERSION
 
-  spec.add_dependency 'rails', '>= 4.2', '< 6'
+  spec.add_dependency 'activerecord', '>= 4.2', '< 6'
 
   spec.add_development_dependency 'database_cleaner'
   spec.add_development_dependency 'factory_bot_rails'