[CHANGELOG] Add note about other package managers than Homebrew.

CHANGELOG.md

@@ -32,6 +32,10 @@ To install or update CocoaPods see this [guide](http://docs.cocoapods.org/guides
   yet which process causes this, but there shouldn’t be a need for any process
   to read data from the root path anyways._
   
+  **NOTE 2**: _If you’re using a package manager other than Homebrew, please
+  submit a pull-request that adds the prefix of that manager
+  [here](https://github.com/CocoaPods/CocoaPods/blob/master/bin/sandbox-pod#L40)._
+
 * Documentation generation has been removed from CocoaPods as it graduated
   to CocoaDocs. This decision was taken because CocoaDocs is a much better
   solution which doesn't clutter Xcode's docsets while still allowing