update readme with known issues

README.md

@@ -1,5 +1,7 @@
 # invrs-gym
-`v1.4.5`
+<a href="https://invrs-io.github.io/gym/"><img src="https://img.shields.io/badge/Docs-blue.svg"/></a>
+![Continuous integration](https://github.com/invrs-io/gym/actions/workflows/build-ci.yml/badge.svg)
+![PyPI version](https://img.shields.io/pypi/v/invrs-gym)
 
 ## Overview
 The `invrs_gym` package is an open-source gym containing a diverse set of photonic design challenges, which are relevant for a wide range of applications such as AR/VR, optical networking, LIDAR, and others. For a full description of the gym, see the [manuscript](https://arxiv.org/abs/2410.24132).
@@ -212,6 +214,10 @@ Please also cite the original paper in which the challenge used was introduced (
 
 </details>
 
+## Known issues
+- jax versions above 0.4.35 have a bug which causes challenges making use of `jax.ensure_compile_time_eval` to fail.
+
+
 ## Testing
 Some tests are marked as slow and are skipped by default. To run these manually, use
 ```