Update bash

Changes:

- https://github.com/tianon/docker-bash/commit/79fe6ec: Update to commit db26b1cf58aab63c39fd5665590cad3cb75eab72

library/bash

@@ -3,9 +3,9 @@
 Maintainers: Tianon Gravi <[email protected]> (@tianon)
 GitRepo: https://github.com/tianon/docker-bash.git
 
-Tags: devel-20190906, devel
+Tags: devel-20190913, devel
 Architectures: amd64, arm32v6, arm32v7, arm64v8, i386, ppc64le, s390x
-GitCommit: 43b543d78a7893c496d0dd470bdd8be9e459547c
+GitCommit: 79fe6ecb6592c920ceda3f7857270b6bf05a1211
 Directory: devel
 
 Tags: 5.0.11, 5.0, 5, latest