updated VENDORS for 2.0.21
updated vendors to dev branches
Updated year range in LICENSE
merged branch gajdaw/year (PR #467)

This PR was merged into the 2.0 branch.

Commits
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8f40361 Updated year range in LICENSE

Discussion
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Updated year range in LICENSE
fixed security example configuration for the /_internal prefix
Merge branch '2.0' into 2.1

* 2.0:
  fixed security example configuration for the /_internal prefix
  Updated year range in LICENSE
  updated vendors to dev branches
  updated VENDORS for 2.0.21

Conflicts:
	app/config/security.yml
	deps.lock
Merge branch '2.1'

* 2.1:
  fixed security example configuration for the /_internal prefix
  Updated year range in LICENSE
  updated vendors to dev branches
  updated VENDORS for 2.0.21