Bumped version to 4.1.0, bumped external-editor dependency to ^2.1.0 …

[kreig303]

…to remove jschardet LGPL license dependency.

Final fix for Issue #574.

[kreig303]

Ran npm test too... first time it failed on

1) inquirer.prompt
       hierarchical mode (`when`)
         should run prompt if `when` returns true:
     Error: Timeout of 2000ms exceeded. For async tests and hooks, ensure "done()" is called; if returning a Promise, ensure it resolves.

but then the second time (et seq.) it ran fine... just fyi?

[SBoudrias]

Thanks! I'll make a release tonight.