FIX: add in quantecon install for compat with anaconda base

Author: mmcky

lectures/lagrangian_lqdp.md

@@ -11,14 +11,19 @@ kernelspec:
   name: python3
 ---
 
+# Lagrangian for LQ Control
+
+```{code-cell} ipython3
+:tags: [hide-output]
+!pip install quantecon
+```
+
 ```{code-cell} ipython3
 import numpy as np
 from quantecon import LQ
 from scipy.linalg import schur
 ```
 
-# Lagrangian for LQ Control
-
 +++
 
 ## Overview