Update bash

Changes:

- https://github.com/tianon/docker-bash/commit/455f780: Update to commit 194cfc28f8c573736dec4e51fbfa1681a072c7f3

library/bash

@@ -3,9 +3,9 @@
 Maintainers: Tianon Gravi <[email protected]> (@tianon)
 GitRepo: https://github.com/tianon/docker-bash.git
 
-Tags: devel-20190712, devel
+Tags: devel-20190719, devel
 Architectures: amd64, arm32v6, arm32v7, arm64v8, i386, ppc64le, s390x
-GitCommit: cf29441746c454c2a3a9143579ac73261ef49171
+GitCommit: 455f78047f1e0d59170f68ff0caeebc3762437ea
 Directory: devel
 
 Tags: 5.0.7, 5.0, 5, latest