Revert to restic 0.13.1 (#1649) (#1657)

Signed-off-by: Tamal Saha <tamal@appscode.com>

Author: 1gtm

Makefile

@@ -42,7 +42,7 @@ else
 	endif
 endif
 
-RESTIC_VER       := 0.14.0
+RESTIC_VER       := 0.13.1
 
 ###
 ### These variables should not need tweaking.