Update stdsimd submodule

alexcrichton · alexcrichton · commit b9b5d6d27508 · 2018-10-09T14:21:42.000-07:00
Should hopefully bring documentation for wasm intrinsics online!
diff --git a/src/stdsimd b/src/stdsimd
@@ -1 +1 @@
-Subproject commit fe825c93788c841ac1872e8351a62c37a5f78427
+Subproject commit 307650500de5b44dc1047dc9d15e449e09d92b57
