export `sha1` alias?

[mitchellwrosen]

Hello, would you accept a patch to export aliases for hash, hashlazy, hmac, and hmaclazy that indicate the hash function being used? My use case is simply, I prefer not using qualified imports :)

Something like

sha1 :: ByteString -> ByteString
sha1lazy :: ByteString -> ByteString
hmacSha1 :: ByteString -> ByteString -> ByteString
hmacSha1lazy :: ByteString -> ByteString -> ByteString