Bump semver from 6.3.0 to 6.3.1 #555

Job	Run time
Installer test (pgsql, 5.4)	6m 32s
Installer test (pgsql, 5.5)	4m 24s
Installer test (pgsql, 5.6)	3m 44s
Installer test (pgsql, 7.0)	4m 31s
Installer test (pgsql, 7.1)	3m 58s
Installer test (pgsql, 7.2)	4m 57s
Installer test (pgsql, 7.3)	4m 36s
Run on Linux (test:e2e, test/front_login)	5m 59s
Installer test (pgsql, 7.4)	4m 36s
Run on Linux (test:e2e, test/front_guest)	4m 29s
Installer test (pgsql, 8.0)	3m 58s
Run on Linux (test:e2e, test/admin)	4m 32s
Installer test (pgsql, 8.1)	3m 51s
Run on Linux (test:e2e-extends, test/front_login)	3m 50s
Installer test (pgsql, 8.2)	3m 47s
Run on Linux (test:e2e-extends, test/front_guest)	3m 31s
Installer test (mysql, 5.4)	4m 58s
Run on Linux (test:e2e-extends, test/admin)	5m 34s
Installer test (mysql, 5.5)	4m 35s
Installer test (mysql, 5.6)	4m 38s
Installer test (mysql, 7.0)	4m 4s
Installer test (mysql, 7.1)	4m 13s
Installer test (mysql, 7.2)	4m 12s
Installer test (mysql, 7.3)	4m 11s
Installer test (mysql, 7.4)	3m 55s
Installer test (mysql, 8.0)	4m 51s
Installer test (mysql, 8.1)	3m 59s
Installer test (mysql, 8.2)	4m 16s
	2h 4m 41s

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