Deprecations

[aleene]

I get warnings in CryptoSwiftMD5:

'deinitialize()' is deprecated: the default argument to deinitialize(count:) has been removed, please specify the count explicitly

and

'deallocate(capacity:)' is deprecated: Swift currently only supports freeing entire heap blocks, use deallocate() instead

I guess:

    valuePointer.deinitialize(count:totalBytes)
    valuePointer.deallocate()

solves this correctly.