fix: Remove unused left-pad

[iiska]

Remove unused left-pad dependency from package.json.

[vasco-santos]

Hey @iiska

Thanks for the PR. I will ask you for an unrelated change here. TLDR, we used to have a commitlint job in our repos, which has been problematic for new contributors because the CI fails and usually people don't know what is happening. As a result, we decided to remove the commitlint from CI and the maintainer should be responsible to guarantee that the commit message is properly written while merging the PR, through squash merge. FYI, in this case the CI is failing because it should be: fix: removed unused left-pad to be correct according to the standard commitlint rules.

Can you just remove this line please? With this, the CI will be green again and we will be able to proceed
https://github.com/ipfs/js-ipns/blob/master/.travis.yml#L23

[vasco-santos]

Thanks, LGTM!