chore: change the default port to 3000

.env.example

@@ -1,2 +1,3 @@
 ENV=local
-TOKEN=your-token
+TOKEN=your-token
+PORT=3000

README.md

@@ -40,7 +40,7 @@ ENV=local
 An example of environment variable is provided [here](.env.example)
 
 * Install dependency: `npm install`
-* Start the app `<list-of-env-and-values> npm run start-dev` and go to `http://localhost:5000`
+* Start the app `<list-of-env-and-values> npm run start-dev` and go to `http://localhost:3000`
 
 ## Feature tracker:
 You can see the feature progress and pick up some issues in the [issues](https://github.com/wildan3105/github-langs/issues) or [projects](https://github.com/wildan3105/github-langs/projects) or [milestones](https://github.com/wildan3105/github-langs/milestones)

src/index.js

@@ -1,5 +1,5 @@
 const app = require('./api/app');
 
-const server = app.listen(process.env.PORT || 5000, () => {
+const server = app.listen(process.env.PORT || 3000, () => {
     console.log(`github-langs running on port: ${server.address().port}`);
 });