update idl version (#99)

Jason Bulicek · ashishagg · commit 64195dd4a703 · 2019-03-26T15:27:09.000+05:30
diff --git a/haystack-idl b/haystack-idl
@@ -1 +1 @@
-Subproject commit 4d5c07c98c6e76fb4fe8b0a76468366330fe6bb0
+Subproject commit e6b8199f7b6f149a655d40e1da00d4ec52af2804
