Update README.md

Author: p-christ

README.md

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 This repository contains PyTorch implementations of deep reinforcement learning algorithms and environments. 
 
-(To help you remember things you learn about machine learning in general write them in [Gizmo](https://gizmo.ai)
+(To help you remember things you learn about machine learning in general write them in [Gizmo](https://gizmo.ai))
 ## **Algorithms Implemented**  
 
 1. *Deep Q Learning (DQN)* <sub><sup> ([Mnih et al. 2013](https://arxiv.org/pdf/1312.5602.pdf)) </sup></sub>