Bump std++ once more.

ef511c16 · Robbert Krebbers · e8edb3d8 · ef511c16
Commit ef511c16 authored Feb 21, 2019 by Robbert Krebbers
--- a/opam
+++ b/opam
@@ -11,5 +11,5 @@ install: [make "install"]
 remove: ["rm" "-rf" "%{lib}%/coq/user-contrib/iris"]
 depends: [
  "coq" { (>= "8.7.1" & < "8.10~") | (= "dev") }
-  "coq-stdpp" { (= "dev.2019-02-21.1.5eabf109") | (= "dev") }
+  "coq-stdpp" { (= "dev.2019-02-21.2.425c0d18") | (= "dev") }
 ]