Fix build

[NikVolf]

No description provided.

[debris]

Actually, I'm not sure about this change. All other modules on master are using ethereum-types 0.1. How is the build broken? I can't see it on gitlab

[NikVolf]

it's broken, because Cargo.lock is also not up-to-date

if you checkout master and do ./test.sh, it will rebuild Cargo.lock and fail to compile after

see this for example: https://gitlab.parity.io/parity/parity/-/jobs/78265

[debris]

ahh, you are right! I thought you changed 0.1 -> 0.2, but it is 0.2 -> 0.1