@dev1644 Please remove the lockfile change from this PR.

Done @justinjmoses , Removed lock-file but can't run coverage as Heap out of memory error popping up. Root cause of the error is coming from Node runtime I searched for some solutions -:

• export NODE_OPTIONS=--max_old_space_size=4096, increasing maximum memory available at the run time I was able to run the coverage.

• buidler --max-memory 4096 coverage --network coverage, I also search through Builder's issues and found out this. I tried to use this by modifying coverage npm script to "coverage": "buidler --max-memory 4096 coverage --network coverage", but it was still breaking.

I also monitor the node runtime service executes after starting coverage tests, I noticed at the time compilation of coverage contracts the runtime was consuming 2.8 GB of memory, Default memory cap of node runtime is ~1.8 GB, so that might be causing the problem.

Node is allocated more memory for coverage now, so if you merge from develop this should be resolved.

Thanks @dev1644 however we need to discuss this issue more thoroughly before accepting any fixes to it (please see my comment on the issue). I am closing this for now but we can reopen in the future if need be.