Cairo 0.9.1 support

[ca11ab1e]

Cairo 0.9.1 introduced support for and in if statements (if x == y and z == w). And running Amarna on a contract using such statement will fail:

Could not parse contract.cairo: Unexpected token Token('IDENTIFIER', 'and') at line 1158, column 31.
Expected one of: 
        * LBRACE
        * DOT
        * SLASH
        * LPAR
        * LSQB
        * MINUS
        * COLON
        * STAR
        * PLUS
        * _DBL_STAR

[ca11ab1e]

Wow you were blazing fast, thanks!

[coolhill]

This will make it into a release on PyPi soon enough. For now you can install the latest amarna version from the repo manually:

git clone https://github.com/crytic/amarna.git && cd amarna
pip install -e .

[ca11ab1e]

Tested, and I confirm the fix works 👍