upgrade quantecon-book-theme==0.7.2

Author: mmcky

environment.yml

@@ -9,7 +9,7 @@ dependencies:
   - pip:
     - jupyter-book==0.15.1
     - docutils==0.17.1
-    - git+https://github.com/QuantEcon/quantecon-book-theme@admonition-style-update
+    - quantecon-book-theme==0.7.2
     - sphinx-tojupyter==0.3.0
     - sphinxext-rediraffe==0.2.7
     - sphinx-exercise==0.4.1