Updates trashman: 1ab366f Adds link to gr-gsm install docs

diff --git a/trashman b/trashman
index 7239f3c5b30b42ae874e86c3bd8ad4a11c665b9a..1ab366faf1554002d3463a88c176bdec9efa3ac9 160000 (submodule)
--- a/trashman
+++ b/trashman
@@ -1 +1 @@
-Subproject commit 7239f3c5b30b42ae874e86c3bd8ad4a11c665b9a
+Subproject commit 1ab366faf1554002d3463a88c176bdec9efa3ac9