Added Bottle() constructor

Author: deepak-acharya-97

app.py

@@ -1,7 +1,7 @@
-from bottle import route, run
-
-@route('/hello')
+from bottle import Bottle, run
+app=Bottle()
+@app.route('/hello')
 def hello():
     return "<h1>Hello World</h1>"
 
-run(host='localhost', port=5555, debug=True)
+run(app, host='localhost', port=5556, debug=True)