Update bash

Changes:

- https://github.com/tianon/docker-bash/commit/887f3d4: Update to commit e76c732799615a5c51c64605454aaf492ebdd83d

library/bash

@@ -3,9 +3,9 @@
 Maintainers: Tianon Gravi <[email protected]> (@tianon)
 GitRepo: https://github.com/tianon/docker-bash.git
 
-Tags: devel-20200515, devel
+Tags: devel-20200518, devel
 Architectures: amd64, arm32v6, arm32v7, arm64v8, i386, ppc64le, s390x
-GitCommit: 589e5b0f056aed5ba755bdbb352c7ba45180449f
+GitCommit: 887f3d4d63f6c990c5ed743b43167f2c6c6dc4c7
 Directory: devel
 
 Tags: 5.0.17, 5.0, 5, latest