Add ecdsa to overrides.json
Add ecdsa to overrides.json

Thanks to Cyril Roelandt for the info.
svisser/caniusepython3,nett55/caniusepypy,ctismer/caniusepython3,brettcannon/caniusepython3,public/caniusepypy,dhamaniasad/caniusepython3