Get rid of alltt in base

IPython/nbconvert/templates/latex/latex_base.tplx

@@ -14,13 +14,12 b' This template does not define a docclass, the inheriting class must define this.'
     \usepackage{adjustbox} % Used to constrain images to a maximum size 
     \usepackage{color} % Allow colors to be defined
     \usepackage{enumerate} % Needed for markdown enumerations to work
-    \usepackage{fancyvrb} % Needed to support color codes (tex) in verbatim blocks
     \usepackage{geometry} % Used to adjust the document margins
     \usepackage{amsmath} % Equations
     \usepackage{amssymb} % Equations
     \usepackage[utf8]{inputenc} % Allow utf-8 characters in the tex document
     \usepackage{ucs} % Extended unicode (utf-8) support
-    \usepackage{alltt} % Verbatim replacement that allows latex
+    \usepackage{fancyvrb} % verbatim replacement that allows latex
     \usepackage{grffile} % extends the file name processing of package graphics 
                          %to support a larger range