fix(rest): move @types/cors to dependency

Author: shimks

packages/rest/package.json

@@ -25,6 +25,7 @@
     "@loopback/core": "^0.2.1",
     "@loopback/openapi-v3": "^0.3.0",
     "@loopback/openapi-v3-types": "^0.2.1",
+    "@types/cors": "^2.8.3",
     "@types/http-errors": "^1.6.1",
     "@types/node": "^8.5.9",
     "body": "^5.1.0",
@@ -40,7 +41,6 @@
     "@loopback/openapi-spec-builder": "^0.3.0",
     "@loopback/repository": "^0.2.1",
     "@loopback/testlab": "^0.3.0",
-    "@types/cors": "^2.8.3",
     "@types/debug": "0.0.30",
     "@types/js-yaml": "^3.9.1",
     "@types/lodash": "^4.14.96"