Restore BL's authorship attribution, and add "The Jsoncpp Authors" where it was missing.

Requested/noticed in https://github.com/open-source-parsers/jsoncpp/pull/610, and a
followup to https://github.com/open-source-parsers/jsoncpp/pull/607 .
diff --git a/devtools/licenseupdater.py b/devtools/licenseupdater.py
index 43ddb4f..36bdb5c 100644
--- a/devtools/licenseupdater.py
+++ b/devtools/licenseupdater.py
@@ -6,7 +6,7 @@
 # and ends with the first blank line.
 LICENSE_BEGIN = "// Copyright "
 
-BRIEF_LICENSE = LICENSE_BEGIN + """2007-2010 The JsonCpp Authors
+BRIEF_LICENSE = LICENSE_BEGIN + """2007-2010 Baptiste Lepilleur and The JsonCpp Authors
 // Distributed under MIT license, or public domain if desired and
 // recognized in your jurisdiction.
 // See file LICENSE for detail or copy at http://jsoncpp.sourceforge.net/LICENSE