Remove lodash from tests

[exemplarov]

Extracted from #1242

🚀 Description

• [+] 📘 I've reviewed the OpenZeppelin Contributor Guidelines
• [+] ✅ I've added tests where applicable to test my new functionality.
• [+] 📖 I've made sure that my contracts are well-documented.
• [+] 🎨 I've run the JS/Solidity linters and fixed any issues (npm run lint:fix).

[nventuro]

This is great @urvalla, thanks! I'm a bit unsure regarding losing range, for larger arrays we may want to introduce our own helper.

Are these all of the instances of lodash? If so, could you also remove it from the package.json?

[shrugs]

approved as well, pending package.json update. thanks @urvalla!

[exemplarov]

Thanks for fast reviews!

Lodash is not declared in package.json explicitly. It is a dependency of babel, eslint, etc.

The Travis build has been terminated. That's weird a little bit, as "unit tests with coverage" in the same build are fine.

[shrugs]

Looks like mocha didn't exist because of an unresolved promise. I'm going to restart to build and see if it was a fluke, but it might be helpful to run https://github.com/mafintosh/why-is-node-running to figure out what promise isn't resolving

[frangio]

The build seems to be passing now. This looks good to me. Thanks @urvalla!