Update lib/protobuf/text.ex

Co-authored-by: Andrea Leopardi <[email protected]>

Author: v0idpwn

lib/protobuf/text.ex

@@ -95,7 +95,7 @@ defmodule Protobuf.Text do
               []
 
             _ ->
-              raise "Invalid value for oneof `#{inspect(name)}`: #{inspect(value)}"
+              raise "invalid value for oneof `#{inspect(name)}`: #{inspect(value)}"
           end
         else
           raise "unknown field #{inspect(name)}"