Add François Langot to advisory committee

_data/advisory_committee.yml

@@ -26,6 +26,10 @@
   affiliation: Senior Fellow at the Hoover Institution on War, Revolution and Peace, Stanford University
   webpage: https://kenjudd.org/
 
+- name: François Langot
+  affiliation: Professor of Economics at Le Mans University and Senior member of the Institut Universitaire de France
+  webpage: https://sites.google.com/site/francoislangothome/home
+
 - name: Douglas Laxton
   affiliation: Director of Saddle Point Research and The Better Policy Project
   webpage: http://www.douglaslaxton.org/