Maintainer replacement

I put my name here because Michal Čihař resigned from phpMyAdmin
https://blog.cihar.com/archives/2019/05/29/spring-cleanup/
I hope this change is okay :)
[ci skip]
Signed-off-by: William Desportes <williamdes@wdes.fr>

generate-stackbrew-library.sh

@@ -46,7 +46,7 @@ dockerfileCommit() {
 cat <<-EOH
 # This file is generated via https://github.com/phpmyadmin/docker/blob/$(fileCommit "$self")/$self
 Maintainers: Isaac Bennetch <bennetch@gmail.com>
-             Michal Čihař <michal@cihar.com>
+             William Desportes <williamdes@wdes.fr>
 GitRepo: https://github.com/phpmyadmin/docker.git
 EOH