MAINTAINERS: Update e-mail address

Replace former professional address by my personal e-mail.

Signed-off-by: Joao Marcos Costa <jmcosta944@gmail.com>
diff --git a/MAINTAINERS b/MAINTAINERS
index 4d1930f..fa8c13f 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -1313,7 +1313,7 @@
 F:	include/spmi/
 
 SQUASHFS
-M:	Joao Marcos Costa <joaomarcos.costa@bootlin.com>
+M:	Joao Marcos Costa <jmcosta944@gmail.com>
 R:	Thomas Petazzoni <thomas.petazzoni@bootlin.com>
 R:	Miquel Raynal <miquel.raynal@bootlin.com>
 S:	Maintained