ERP5: Add xlrd egg that is required by pandas.read_excel()

stack/erp5/buildout.cfg

@@ -518,6 +518,7 @@ eggs = ${neoppod:eggs}
 # Needed for checking ZODB Components source code
   pylint
   pytracemalloc
+  xlrd
 
 # Zope
   Zope2
@@ -759,6 +760,7 @@ dask = 0.18.1
 toolz = 0.9.0
 zope.globalrequest = 1.5
 waitress = 1.3.0
+xlrd = 1.1.0
 
 # Re-add for as it is required to be there for uninstallation
 erp5.recipe.w3validator = 1.0.2