Update _config.yml (#215)

Co-authored-by: mmcky <[email protected]>

Author: DrDrij

lectures/_config.yml

@@ -53,8 +53,8 @@ sphinx:
       og_logo_url: https://assets.quantecon.org/img/qe-og-logo.png
       description: This website presents introductory lectures on computational economics, designed and written by Thomas J. Sargent and John Stachurski.
       keywords: Python, QuantEcon, Quantitative Economics, Economics, Sloan, Alfred P. Sloan Foundation, Tom J. Sargent, John Stachurski
-      # analytics:
-      #   google_analytics_id: UA-54984338-9
+      analytics:
+        google_analytics_id: G-QDS1YRJNGM
       launch_buttons:
         notebook_interface        : classic  # The interface interactive links will activate ["classic", "jupyterlab"]
         binderhub_url             : https://mybinder.org  # The URL of the BinderHub (e.g., https://mybinder.org)