Add rubocop to our build. (#5004)

lib/discourse_redis.rb

@@ -125,10 +125,10 @@ class DiscourseRedis
   end
 
   def self.slave_config(options = config)
-    options.dup.merge!({ host: options[:slave_host], port: options[:slave_port] })
+    options.dup.merge!(host: options[:slave_host], port: options[:slave_port])
   end
 
-  def initialize(config=nil)
+  def initialize(config = nil)
     @config = config || DiscourseRedis.config
     @redis = DiscourseRedis.raw_connection(@config)
   end
@@ -182,7 +182,7 @@ class DiscourseRedis
   end
 
   def mget(*args)
-    args.map!{|a| "#{namespace}:#{a}"}
+    args.map! { |a| "#{namespace}:#{a}" }
     DiscourseRedis.ignore_readonly { @redis.mget(*args) }
   end
 
@@ -193,10 +193,10 @@ class DiscourseRedis
     end
   end
 
-  def keys(pattern=nil)
+  def keys(pattern = nil)
     DiscourseRedis.ignore_readonly do
       len = namespace.length + 1
-      @redis.keys("#{namespace}:#{pattern || '*'}").map{
+      @redis.keys("#{namespace}:#{pattern || '*'}").map {
         |k| k[len..-1]
       }
     end
@@ -210,7 +210,7 @@ class DiscourseRedis
 
   def flushdb
     DiscourseRedis.ignore_readonly do
-      keys.each{|k| del(k)}
+      keys.each { |k| del(k) }
     end
   end