v2.6.0

• Support board coordinates > 26

v2.5.0

• Accept empty nodes in SGFs
• Enforce UTF-8 on output

v2.3.0

• Updated SgfToken::is_root_token to handle all the new tokens
• Added SgfToken::is_game_info_token and SgfToken::is_setup_token
• Added GameTree::is_valid function to check that a GameTree only has root tokens in the root node

v2.2.0

Add support for the following tokens: RE, HA, RU, GM, CA, OB/W, AP, OT, ST, FF

v2.1.0

• Support RE and H tokens
• Support multiple values tied to a single identifier

v2.0.0

• Support for most SGF tokens
• New structure for the SgfToken::Move variant to support passing