FUTURE BROKEN SDK -- deprecated version of celo/contractkit used

[aaronmgdr]

Hi,

I see this seemingly supported repo is using a deprecated version of celo contractkit.

This version of contractkit only supports transaction type that will cease to function when celo completes its L2 transition.

The minimum supported version of contract kit is @celo/contractkit@8.1.0

I recommend upgrading within the next 3 months.

[aaronmgdr]

@Sjors you will need to upgrade for transactions signed to be compatible with the next celo hardfork