Handle "Error: Transaction was not mined within 50 blocks..."

[dOrgJelli]

Currently the migration script doesn't handle the case where web3.js' retries exceeds 50 tries. You can read more about this issue here:
web3/web3.js#1102

I foresee this issue being resolved along with this one within the same change-set:
#206

[yangwao]

Looking forward, you are doing great work 🤗

[dOrgJelli]

I think this might be the way to go about handling this @ben-kaufman web3/web3.js#1102 (comment)