update devfile registry maintainers list (#201)

Signed-off-by: Michael Valdron <[email protected]>

Author: michael-valdron

deploy/chart/devfile-registry/Chart.yaml

@@ -18,4 +18,11 @@ name: "devfile-registry"
 version: "0.0.1"
 home: "https://devfile.io/"
 maintainers:
-- name: John Collier
+  - email: [email protected]
+    name: Michael Valdron
+  - email: [email protected]
+    name: John Collier
+  - email: [email protected]
+    name: Theofanis Petkos
+  - email: [email protected]
+    name: Jordan Dubrick