Add 'remember' note for setting store in initializer

In the 'Testing with CarrierWave' section. [ci skip]
carrierwaveuploader · Jul 18, 2013 · 4f7e42f · 4f7e42f
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diff --git a/README.md b/README.md
@@ -474,6 +474,9 @@ if Rails.env.test? or Rails.env.cucumber?
 end
 ```
 
+Remember, if you have already set `storage :something` in your uploader, the `storage`
+setting from this initializer will be ignored.
+
 If you need to test your processing, you should test it in isolation, and enable
 processing only for those tests that need it.