Snowflake improvements

v0.31.2

Improvements

Snowflake update:

1. Added support for Snowflake AUTOINCREMENT | IDENTITY column definitions with optional parameter ORDER|NOORDER statement - #213

Common

1. Added param 'encoding' to parse_from_file function - #142.
   Default encoding is utf-8.

Thanks to https://github.com/dmaresma for contributions.