Update README.md

README.md

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-## Quick-start: Installationa and Usage
+## Quick-start: Installation and Usage
 
 In order to use `pymdp` to build and develop active inference agents, we recommend installing it with the the package installer [`pip`](https://pip.pypa.io/en/stable/), which will install `pymdp` locally as well as its dependencies. This can also be done in a virtual environment (e.g. with `venv`).