Updates OS images for Equinix Metal, Scaleway and Linode to Ubuntu 20.04.

Updates OS images for Equinix Metal, Scaleway and Linode to Ubuntu 20.04.

Changelog for 0.13.2:

• PR #132 Add plan override flag for Equinix Metal by @alexellis
• PR #131 equinix-metal: update to Ubuntu 20.04 and available plan type by @rawkode
• PR #127 Scaleway: Update Image to Ubuntu 20_04 by @dirien
• PR #128 Linode: Update Image to Ubuntu 20_04 by @dirien

Commits
7ce7ac3 Add plan override flag for Equinix Metal by @alexellis
35de486 Remove default provider by @alexellis
6fcf6d1 chore: cleaning up code readability by @rawkode
f89452c chore: update OS and plan for Equinix Metal by @rawkode
13b5f15 chore: update inlets version to 0.8.5 by @rawkode
aaccfde Scaleway: Update Image to Ubuntu 20_04 by @dirien
f66d0af Linode: Update Image to Ubuntu 20_04 by @dirien
fbe4503 Update DEV instructions by @alexellis

Generated by Derek