Update .editorconfig

Author: SimonCropp

src/.editorconfig

@@ -367,7 +367,7 @@ ij_xml_space_inside_empty_tag = true
 indent_size = 2
 
 # Verify settings
-[*.{received,verified}.{txt,xml,json,md,sql,csv,html,htm,md}]
+[*.{received,verified}.{txt,xml,json,md,sql,csv,html,htm,md,nuspec,rels}]
 charset = utf-8-bom
 end_of_line = lf
 indent_size = unset