Update version to `0.3.6`.

Update AvailableMethods.md.

Update version to `0.3.4`.

Merge pull request #21 from Chipe1/before_lt_0_ignored

Skip before_lt only when it's None

Merge pull request #18 from Chipe1/cgv-add-single-jetton-balance

Add method to get single Jetton balance by owner address

Update version to `0.3.1`.

Update version to `0.3.0`.

Update version to `0.2.9`.

Update version to `0.2.8`.

Update version to `0.2.6`.