fix(example): update middleware usage example

Author: sonicoder86

.npmignore

@@ -1,4 +1,3 @@
 *.spec.js
 node_modules
 .idea
-tmp

koaexample.js renamed to koa-example.js

@@ -12,8 +12,9 @@ app.use(async (ctx, next) => {
   await next();
 });
 app.use(logFactory.getMiddleware());
-app.use(async () => {
+app.use(async (ctx) => {
   logger.info('works');
+  ctx.body = 'It works';
 });
 
 app.listen(port);

package-lock.json

@@ -6,7 +6,8 @@
   "scripts": {
     "test": "mocha ./src/ --recursive",
     "test:watch": "mocha ./src/ --recursive --watch",
-    "semantic-release": "CI=true semantic-release pre && npm publish --access public && semantic-release post"
+    "semantic-release": "CI=true semantic-release pre && npm publish --access public && semantic-release post",
+    "koa-example": "DEBUG=* node koa-example.js"
   },
   "bin": {
     "json-logger": "./bin/json-logger.js"