fix(keychain-vault): add missing license to openapi.json

Fixes #493

Signed-off-by: Peter Somogyvari <[email protected]>

Author: petermetz

packages/cactus-plugin-keychain-vault/src/main/json/openapi.json

@@ -3,7 +3,11 @@
   "info": {
     "title": "Hyperledger Cactus - Keychain API",
     "description": "Contains/describes the Keychain API types/paths for Hyperledger Cactus.",
-    "version": "0.3.0"
+    "version": "0.3.0",
+    "license": {
+      "name": "Apache 2.0",
+      "url": "https://www.apache.org/licenses/LICENSE-2.0.html"
+    }
   },
   "components": {
     "schemas": {}