chore(package): update lodash.merge to version 4.6.1 (#112)

Author: alexander-fenster

handwritten/spanner/package.json

@@ -73,7 +73,7 @@
     "is": "^3.1.0",
     "lodash.chunk": "^4.2.0",
     "lodash.flatten": "^4.4.0",
-    "lodash.merge": "^4.6.0",
+    "lodash.merge": "^4.6.1",
     "lodash.snakecase": "^4.1.1",
     "merge-stream": "^1.0.1",
     "methmeth": "^1.1.0",