added eurosym package to define \euro symbol

IPython/nbconvert/templates/latex/base.tplx

@@ -20,6 +20,7 b' This template does not define a docclass, the inheriting class must define this.'
     \usepackage{geometry} % Used to adjust the document margins
     \usepackage{amsmath} % Equations
     \usepackage{amssymb} % Equations
+    \usepackage{eurosym} % defines \euro
     \usepackage[mathletters]{ucs} % Extended unicode (utf-8) support
     \usepackage[utf8x]{inputenc} % Allow utf-8 characters in the tex document
     \usepackage{fancyvrb} % verbatim replacement that allows latex