Add Marco Del Negro to advisory committee

_data/advisory_committee.yml

@@ -10,6 +10,10 @@
   affiliation: Head of Forecasting and Policy Modelling Division, European Central Bank
   webpage: https://www.ecb.europa.eu/pub/research/authors/profiles/guenter-coenen.en.html
 
+- name: Marco Del Negro
+  affiliation: Vice President, Macroeconomic and Monetary Studies Function, Federal Reserve Bank of New York
+  webpage: https://www.newyorkfed.org/research/economists/delnegro/index.html
+
 - name: Wouter den Haan
   affiliation: Professor of Economics at the London School of Economics and Political Science and co-director of the Centre for Macroeconomics
   webpage: http://www.wouterdenhaan.com/index.htm