Update app.py

Author: codeby-nurgul

app.py

@@ -3,7 +3,7 @@
 
 @app.route('/')
 def home():
-    return "Hello from Python in Docker!"
+    return "Hello from main branch!"
 
 if __name__ == '__main__':
     app.run(host='0.0.0.0', port=80)