Fix mastodon#6 - Rate limit GET reqs to 300/5min, POST to 100/5min

Author: Gargron

config/initializers/rack-attack.rb

@@ -1,5 +1,9 @@
 class Rack::Attack
-  throttle('req/ip', limit: 300, period: 5.minutes) do |req|
-    req.ip
+  throttle('get-req/ip', limit: 300, period: 5.minutes) do |req|
+    req.ip if req.get?
+  end
+
+  throttle('post-req/ip', limit: 100, period: 5.minutes) do |req|
+    req.ip if req.post?
   end
 end