Add precommit hook for running linter.

[agbilotia1998]

Is your feature request related to a problem? Please describe.
A pre-commit hook can be added to avoid linting related issues and the errors could be resolved prior to test failure at Travis when pushed at the remote. Or the hook could run tests to check the code failure automatically before committing, probably this could ease the development flow.

Describe the solution you'd like
Addition of pre-commit hook.

[agbilotia1998]

@michalmikolajczyk would you be auditing this through gitcoin?

[michalmikolajczyk]

@agbilotia1998 probably, but we have planned work for a few months to come. We added this task to the next phase of our backlog, we will revisit in a few weeks time.