v0.4.4

• added retrying in case of not being able to allocate a stream id
• added support for deserializing timestamps to i64
• added support for using Time struct as CqlValue, e.g. for serialization structs
• added support for Duration type (from CQL v5)
• added default page size (5000) for query_iter and execute_iter
• switched from deprecated max_value and min_value to ::MAX and ::MIN respectively
• added a new docs theme