chore: update copyright year to 2021

[jbrockopp]

This is a general housekeeping task.

I used VS code's search and replace:

• Search: Copyright (c) 2020
• Replace: Copyright (c) 2021

At the top of every file, the new copyright statement now looks like:

// Copyright (c) 2021 Target Brands, Inc. All rights reserved.

[codecov]

Codecov Report

Merging #58 (ad99a3c) into master (3b970c1) will not change coverage.
The diff coverage is 0.00%.

@@           Coverage Diff           @@
##           master      #58   +/-   ##
=======================================
  Coverage   47.97%   47.97%           
=======================================
  Files           9        9           
  Lines         371      371           
=======================================
  Hits          178      178           
  Misses        191      191           
  Partials        2        2           

Impacted Files	Coverage Δ
cmd/vela-kubernetes/apply.go	96.15% <ø> (ø)
cmd/vela-kubernetes/command.go	100.00% <ø> (ø)
cmd/vela-kubernetes/config.go	100.00% <ø> (ø)
cmd/vela-kubernetes/container.go	100.00% <ø> (ø)
cmd/vela-kubernetes/kubectl.go	84.21% <ø> (ø)
cmd/vela-kubernetes/main.go	0.00% <0.00%> (ø)
cmd/vela-kubernetes/patch.go	97.61% <ø> (ø)
cmd/vela-kubernetes/plugin.go	58.13% <ø> (ø)
cmd/vela-kubernetes/status.go	96.29% <ø> (ø)

[KellyMerrick]

lgtm