Move rate tasks into a namespace

Rakefile

@@ -4,15 +4,19 @@ require 'fixer'
 require 'rake/testtask'
 require 'db'
 
-task :load do
-  Currency.delete
-  data = Fixer::Feed.new(:historical)
-  Currency.multi_insert(data.to_a)
-end
+namespace :rates do
+  desc 'Reload all rates'
+  task :reload do
+    Currency.delete
+    data = Fixer::Feed.new(:historical)
+    Currency.multi_insert(data.to_a)
+  end
 
-task :update do
-  Fixer::Feed.new.each do |hsh|
-    Currency.find_or_create(hsh)
+  desc 'Update rates'
+  task :update do
+    Fixer::Feed.new.each do |hsh|
+      Currency.find_or_create(hsh)
+    end
   end
 end