alexellis/arkade 0.7.20

Fix helm description and allow kubectl to take a v prefix

on GitHub

Changelog for 0.7.20:

• PR #437 Fix kubectl incorrect download URL version by @yankeexe
• PR #435 Fix description for helm on ASCII table. by @yankeexe

Commits
5c09a14 Fix kubectl incorrect download URL version by @yankeexe
1a3a6c7 Fix description for helm on ASCII table. by @yankeexe

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