v0.6.0

Enhancements

• Queries can be constructed of iodata
• Support "type hinted" queries to save one client-server round trip which will reduce query latency

Backwards incompatible changes

• Postgrex.Error postgres field is converted from keyword list to map
• Postgrex.Connect.query params parameter is no longer optional (pass an empty list if query has no parameters)
• The timeout parameter for all functions have been moved to a keyword list with the key :timeout