Updates downloaders: bd20e1e Fix: postfixadmin: simplify source extraction

diff --git a/downloaders b/downloaders
index 066478cac3d8bb7bd89d59584c49f1c25f8d6085..bd20e1e27be3e206fdda338ec5d05b82d635f4b1 160000 (submodule)
--- a/downloaders
+++ b/downloaders
@@ -1 +1 @@
-Subproject commit 066478cac3d8bb7bd89d59584c49f1c25f8d6085
+Subproject commit bd20e1e27be3e206fdda338ec5d05b82d635f4b1