pytorch-lightning version is specified wrong at requirements_lightning.txt 
requirements_lightning.txt requires pytorch-lightning version to be higher than 1.4.9 though it's the latest stable version and it's not possible. Probably meant pytorch-lightning>=1.4.9 instead
![image](https://user-images.githubusercontent.com/17128248/139324215-dc3a360c-de70-4471-89ec-96521222891b.png)
![image](https://user-images.githubusercontent.com/17128248/139324329-abaf315d-191c-43db-b33a-7c1b2dfed0d5.png)
