update Iris so that we can use iSplit again instead of iSplitL

opam

@@ -6,5 +6,5 @@ install: [make "install"]
 remove: ["rm" "-rf" "'%{lib}%/coq/user-contrib/fri"]
 depends: [
   "coq" { (>= "8.7.2") | (= "dev") }
-  "coq-iris"  { (= "branch.gen_proofmode.2018-05-08.0.7af1bbd3") | (= "dev") }
+  "coq-iris"  { (= "branch.gen_proofmode.2018-05-09.1.c2b96095") | (= "dev") }
 ]

theories/chan2heap/simple_reln.v

@@ -1308,7 +1308,7 @@ Tactic Notation "refine_unbind" constr(K) :=
       }
       { rewrite /dK /dinit /Kd. case_match; abstract omega. }
       { iFrame "Hown". iFrame "Hheap". iFrame "Hscheap".
-        repeat iSplitL; iPureIntro; eauto with ndisj. }
+        repeat iSplit; iPureIntro; eauto with ndisj. }
       iApply wp_wand_l. iFrame "Hwp".
       iIntros "!#". iIntros (v) "Hpre".
       iDestruct "Hpre" as (l c) "(%&Hleft&Hright&Hown)".