Minor bug fixed

_data/coding_gym/2019-10-29.yaml

 date: 2019-10-29 17:15
-class: E/F
+room: E/F
 coding_gym_url: https://coding-gym.org/events/2019-10-29-it-polimi/
 contest_url: https://www.hackerrank.com/coding-gym-polimi1019
 registration_url: https://coding-gym-polimi1019.eventbrite.it
\ No newline at end of file

_data/coding_gym/2019-11-25.yaml

 date: 2019-11-25 17:15
-class: 5.0.3
+room: 5.0.3
 coding_gym_url: https://coding-gym.org/events/2019-11-25-it-polimi/
 contest_url: https://www.hackerrank.com/coding-gym-polimi1119
 registration_url: https://coding-gym-polimi1119.eventbrite.it
\ No newline at end of file

_data/coding_gym/2020-01-24.yaml

 date: 2020-01-24 17:15
-class: 3.1.6
+room: 3.1.6
 coding_gym_url: https://coding-gym.org/events/2020-01-24-it-polimi/
 contest_url: https://www.hackerrank.com/coding-gym-polimi0120
 registration_url: https://coding-gym-polimi0120.eventbrite.it
\ No newline at end of file

_data/coding_gym/2020-02-26.yaml

 date: 2020-02-26 17:15
-class: 5.0.2
+room: 5.0.2
 coding_gym_url: https://coding-gym.org/events/2020-02-26-it-polimi/
 contest_url: https://www.hackerrank.com/coding-gym-polimi0220
 registration_url: https://coding-gym-polimi0220.eventbrite.it
\ No newline at end of file