Update packages and fix broken v1 branch

Updating code to match PR: possibilities#76
Keeping own copy to avoid unwanted changes

package.json

@@ -10,27 +10,24 @@
     "type": "git"
   },
   "author": "Mike Bannister <mikebannister@gmail.com>",
-  "main": "lib/index.js",
+  "main": "src/index.js",
   "files": [
-    "lib/index.js"
+    "src/index.js"
   ],
   "license": "MIT",
   "scripts": {
-    "build": "rimraf lib && babel src --out-dir lib",
     "test": "ava --verbose src/test.js",
     "dev": "ava --verbose --watch src/test.js",
-    "prepublish": "yarn build",
     "lint": "standard",
     "pretest": "yarn lint"
   },
   "devDependencies": {
-    "async-to-gen": "^1.3.2",
-    "ava": "^0.19.0",
-    "babel-cli": "^6.24.0",
-    "babel-polyfill": "^6.23.0",
-    "babel-preset-latest": "^6.24.0",
-    "babel-preset-stage-0": "^6.22.0",
-    "babel-register": "^6.24.0",
+    "@ava/babel": "^1.0.1",
+    "@babel/cli": "^7.8.4",
+    "@babel/core": "^7.9.6",
+    "@babel/plugin-transform-runtime": "^7.9.6",
+    "@babel/preset-env": "^7.9.6",
+    "ava": "^3.8.2",
     "micro": "^7.3.0",
     "request": "^2.85.0",
     "request-promise": "^4.2.0",
@@ -40,15 +37,17 @@
   },
   "ava": {
     "failFast": true,
-    "require": [
-      "babel-register"
-    ],
-    "babel": "inherit"
+    "babel": true
   },
   "babel": {
     "presets": [
-      "latest",
-      "stage-0"
+      "@babel/preset-env"
+    ],
+    "plugins": [
+      "@babel/plugin-transform-runtime"
     ]
+  },
+  "dependencies": {
+    "@babel/runtime": "^7.9.6"
   }
-}
+}

src/index.js

@@ -88,8 +88,8 @@ const cors = (options = {}) => handler => async (req, res, ...restArgs) => {
     setVaryHeader(res, origin)
     res.end()
   } else {
-    const handlerResult = await handler(req, res, ...restArgs)
     setVaryHeader(res, origin)
+    const handlerResult = await handler(req, res, ...restArgs)
     return handlerResult
   }
 }