heroku app added

main.py

@@ -7,6 +7,7 @@ from prediction import predict
 import uvicorn
 import json
 import requests
+import os
 
 scopes = [
   "https://www.googleapis.com/auth/userinfo.email",
@@ -107,4 +108,5 @@ async def evaluate(request):
     return templates.TemplateResponse('thanks.html', {'request': request, 'score':score, 'message':message, 'essay':essay})
 
 if __name__ == '__main__':
-    uvicorn.run(app, host='0.0.0.0', port=8040)
\ No newline at end of file
+    port = int(os.environ.get('PORT', 5000))
+    uvicorn.run(app, host='0.0.0.0', port=port)
\ No newline at end of file