minor typo fix

README.md

@@ -7,7 +7,7 @@ JAX-powered Cosmological Particle-Mesh N-body Solver
 
 > ### Note
 > **The new JaxPM v0.1.xx** supports multi-GPU model distribution while remaining compatible with previous releases. These significant changes are still under development and testing, so please report any issues you encounter.
-> For the older version but more stable version, install:
+> For the older but more stable version, install:
 > ```bash
 > pip install jaxpm==0.0.2
 > ```