chore(gitignore): ignore IntelliJ IDEA module files
chore(gitignore): ignore IntelliJ IDEA module files

Make Git ignore IntelliJ IDEA module (*.iml) files.

ReactiveX/rxjs-docs,ReactiveX/rxjs-docs,ashwin-sureshkumar/rxjs-docs,ReactiveX/rxjs-docs,ashwin-sureshkumar/rxjs-docs,ashwin-sureshkumar/rxjs-docs