adding stim

Julia Putko · Julia Putko · commit 09fb79cb1224 · 2021-06-30T10:47:22.000-07:00
diff --git a/extern/stim b/extern/stim
@@ -1 +1 @@
-Subproject commit dc876554d499f98063fba6b7302c3f8492e0a7be
+Subproject commit 7ad9ec1a6f5a0e93c1ca32090003a2d061a02a6d
