update jax install

Author: HumphreyYang

lectures/career.md

@@ -34,15 +34,7 @@ In addition to what's in Anaconda, this lecture will need the following librarie
 ```{code-cell} ipython3
 :tags: [hide-output]
 
-!pip install --upgrade quantecon
-```
-
-We also need to install JAX to run this lecture
-
-```{code-cell} ipython3
-:tags: [skip-execution]
-
-!pip install -U jax
+!pip install quantecon jax
 ```
 
 ## Overview