Update libraries.md (#1607)

Co-authored-by: Sarah Edwards <skedwards88@github.com>

Author: Hamel Husain

content/rest/overview/libraries.md

@@ -111,6 +111,7 @@ Library name | Repository
 
 Library name | Repository
 |---|---|
+**ghapi**|[fastai/ghapi](https://github.com/fastai/ghapi)
 **PyGithub**|[PyGithub/PyGithub](https://github.com/PyGithub/PyGithub)
 **libsaas**|[duckboard/libsaas](https://github.com/ducksboard/libsaas)
 **github3.py**|[sigmavirus24/github3.py](https://github.com/sigmavirus24/github3.py)