don't use array extension function

[sgxiang]

i import exswift in my project , but i found exswift class don't export array extension function,like this:

extension Array {
}

because in exswift module array is defined as internal , how to solve it.

[pNre]

Did you follow these steps: https://github.com/pNre/ExSwift#use-submodule-and-copy-source-code ?