Update phpBB minimum version to 3.1.0-RC3

Author: iMattPro

composer.json

@@ -44,7 +44,7 @@
 	"extra": {
 		"display-name": "Google Analytics",
 		"soft-require": {
-			"phpbb/phpbb": ">=3.1.0-RC2,<3.2.*@dev"
+			"phpbb/phpbb": ">=3.1.0-RC3,<3.2.*@dev"
 		},
 		"version-check": {
 			"host": "version.phpbb.com",