Merge pull request #671 from skalenetwork/670-add-erc20_abi

670-add-erc20_abi: add erc20_abi parameter to Erc20Contract class

Merge pull request #672 from skalenetwork/calls-optimization

Fix typing issue in cache

Merge pull request #669 from skalenetwork/calls-optimization

Add optional redis cache

Merge pull request #667 from skalenetwork/calls-optimization

Remove schain with status structure

Merge pull request #665 from skalenetwork/calls-optimization

Add custom session to track calls, add stats object

Merge pull request #664 from skalenetwork/add-get-public-key-func

Add get public keys function - nodes contract

Merge pull request #661 from skalenetwork/update-schain-functions

Add to_dict methods to schain structures

Merge pull request #660 from skalenetwork/update-schain-functions

Update schain functions

Merge pull request #658 from skalenetwork/add-credit-station

Add credit station project

Merge pull request #659 from skalenetwork/add-credit-station

Fix package version