test(git): fix `gcoghpr` test on Windows on Travis
test(git): fix `gcoghpr` test on Windows on Travis

This commit accounts for a breaking change introduced in `chalk` v4.0.0
(as commit chalk/chalk@f0f4638a92890ba3a329209836d5f904cfeb581a), where
`chalk.Level` is no longer an enum (and a union of numeric literals is
used instead).

gkalpak/aliases