MAINTAINERS/README: Migrate mailing-list to lists.u-boot-project.org

The U-Boot Mailing-list is moving to the lists.u-boot-project.org
domain, so update all references of list.denx.de to the new
domain in the main README and MAINTAINERS files.

Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org>
Reviewed-by: Peter Robinson <pbrobinson@gmail.com>

MAINTAINERS

@@ -2022,7 +2022,7 @@ F:	test/py/tests/test_xxd/
 
 THE REST
 M:	Tom Rini <trini@konsulko.com>
-L:	u-boot@lists.denx.de
+L:	u-boot@lists.u-boot-project.org
 Q:	http://patchwork.ozlabs.org/project/uboot/list/
 S:	Maintained
 T:	git https://source.denx.de/u-boot/u-boot.git

README

@@ -45,9 +45,9 @@ Where to get help:
 
 In case you have questions about, problems with or contributions for
 U-Boot, you should send a message to the U-Boot mailing list at
-<u-boot@lists.denx.de>. There is also an archive of previous traffic
+<u-boot@lists.u-boot-project.org>. There is also an archive of previous traffic
 on the mailing list - please search the archive before asking FAQ's.
-Please see https://lists.denx.de/pipermail/u-boot and
+Please see https://lists.u-boot-project.org/pipermail/u-boot and
 https://marc.info/?l=u-boot
 
 Where to get source code:

tools/u_boot_pylib/gitutil.py

@@ -528,7 +528,7 @@ send --cc-cmd cc-fname" cover p1 p2'
                   "Please add something like this to a commit\n"
                   "Series-to: Fred Bloggs <f.blogs@napier.co.nz>\n"
                   "Or do something like this\n"
-                  "git config sendemail.to u-boot@lists.denx.de")
+                  "git config sendemail.to u-boot@lists.u-boot-project.org")
             return None
     cc = build_email_list(list(set(series.get('cc')) - set(series.get('to'))),
                           alias, '--cc', warn_on_error)