package/mongoose: bump to to version 7.0

Update LICENSE hash; copyright year update:

-Copyright (c) 2004-2013 Sergey Lyubka <valenok@gmail.com>
-Copyright (c) 2013-2018 Cesanta Software Limited
+Copyright (c) 2004-2013 Sergey Lyubka
+Copyright (c) 2013-2020 Cesanta Software Limited

See https://github.com/cesanta/mongoose/releases/tag/7.0



Signed-off-by: Pierre-Jean Texier <texier.pj2@gmail.com>
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>