Implement `GET /crates/:crate_id/maintenance.svg` endpoint#2439

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Turbo87 wants to merge 2 commits intorust-lang:masterfrom

Turbo87:maintenance-badge

Commits on Oct 17, 2020

Implement `GET /crates/:crate_id/maintenance.svg` endpoint
Turbo87
committed

Commits on Oct 18, 2020

Generate maintenance badges via `badge` crate
Turbo87
committed