Fix missing lines in editorconfig (#89)

.editorconfig

@@ -68,6 +68,13 @@ dotnet_naming_symbols.static_fields.required_modifiers = static
 dotnet_naming_style.static_prefix_style.required_prefix = s_
 dotnet_naming_style.static_prefix_style.capitalization = camel_case 
 
+# Comment this group and uncomment out the next group if you don't want _ prefixed fields.
+
+# internal and private fields should be _camelCase
+#dotnet_naming_rule.camel_case_for_private_internal_fields.severity = suggestion
+#dotnet_naming_rule.camel_case_for_private_internal_fields.symbols  = private_internal_fields
+#dotnet_naming_rule.camel_case_for_private_internal_fields.style    = camel_case_underscore_style
+
 # internal and private fields should be _camelCase
 dotnet_naming_rule.camel_case_for_private_internal_fields.severity = suggestion
 dotnet_naming_rule.camel_case_for_private_internal_fields.symbols  = private_internal_fields