Update serverless-http to version 2.0.1 (#4067)

package.json

@@ -113,7 +113,7 @@
     "merge-umi-mock-data": "^1.0.4",
     "mockjs": "^1.0.1-beta3",
     "prettier": "^1.17.0",
-    "serverless-http": "^1.9.1",
+    "serverless-http": "^2.0.1",
     "slash2": "^2.0.0",
     "stylelint": "^9.10.1",
     "stylelint-config-css-modules": "^1.3.0",