Use GPG '--batch' option

LINK: https://bugs.debian.org/913614
LINK: docker-library/busybox#55

library/convertigo

@@ -1,6 +1,6 @@
 Maintainers: Nicolas Albert <[email protected]> (@nicolas-albert), Olivier Picciotto <[email protected]> (@opicciotto)
 GitRepo: https://github.com/convertigo/docker
-GitCommit: 9368d25a7cb56b545ca01fb1d54e0476b18e7fe6
+GitCommit: b4d83c0a41fbf4993d8c8ab9de0628dc64fe3f08
 
 Tags: 7.5.4, 7.5, latest
 Architectures: amd64, arm32v7, arm64v8, i386