style: enable Style/Semicolon rubocop

.rubocop.yml

@@ -68,5 +68,8 @@ Style/RedundantFreeze:
 Style/RedundantSelf:
   Enabled: true
 
+Style/Semicolon:
+  Enabled: true
+
 Style/SingleLineMethods:
   Enabled: true

lib/rack/attack.rb

@@ -65,20 +65,20 @@ class Rack::Attack
       tracks[name] = Track.new(name, options, &block)
     end
 
-    def safelists;
-      @safelists  ||= {};
+    def safelists
+      @safelists  ||= {}
     end
 
-    def blocklists;
-      @blocklists ||= {};
+    def blocklists
+      @blocklists ||= {}
     end
 
-    def throttles;
-      @throttles  ||= {};
+    def throttles
+      @throttles  ||= {}
     end
 
-    def tracks;
-      @tracks     ||= {};
+    def tracks
+      @tracks     ||= {}
     end
 
     def safelisted?(request)

lib/rack/attack/store_proxy/dalli_proxy.rb

@@ -60,8 +60,8 @@ module Rack
         def stub_with_if_missing
           unless __getobj__.respond_to?(:with)
             class << self
-              def with;
-                yield __getobj__;
+              def with
+                yield __getobj__
               end
             end
           end