Update bash

Changes:

- https://github.com/tianon/docker-bash/commit/5dcccbc: Update to commit 3a7c642e223ec260042bfecc12da49717ae77d76

library/bash

@@ -3,9 +3,9 @@
 Maintainers: Tianon Gravi <[email protected]> (@tianon)
 GitRepo: https://github.com/tianon/docker-bash.git
 
-Tags: devel-20191206, devel
+Tags: devel-20191213, devel
 Architectures: amd64, arm32v6, arm32v7, arm64v8, i386, ppc64le, s390x
-GitCommit: 160753682f752dd454deec8712725eef0456eb9d
+GitCommit: 5dcccbcd1151b1e6b817936fbfc2535b6ebf7e6f
 Directory: devel
 
 Tags: 5.0.11, 5.0, 5, latest