add js-yaml (#76)

Co-authored-by: xichen <xichen@microsoft.com>

package.json

@@ -50,6 +50,7 @@
         "eslint-plugin-standard": "^4.0.1",
         "mocha": "^7.1.0",
         "node-yaml": "^4.0.1",
+        "js-yaml": "^3.14.0",
         "nyc": "^15.0.0",
         "ts-node": "^8.6.2",
         "typescript": "^3.8.3"
@@ -59,7 +60,8 @@
         "@azure-tools/codegen": "^2.5.276",
         "@azure-tools/codemodel": "4.13.325",
         "@azure-tools/linq": "^3.1.232",
-        "node-yaml": "^4.0.1"
+        "node-yaml": "^4.0.1",
+        "js-yaml": "^3.14.0"
     },
     "mocha": {
         "diff": true,