add config for std-dev-guide repo (#386)

* add config for std-dev-guide repo

* Update highfive/configs/rust-lang/std-dev-guide.json

Co-authored-by: Eric Huss <eric@huss.org>

* update std-dev-guide review rotation to match libs team

Co-authored-by: Eric Huss <eric@huss.org>

Author: yaahc

highfive/configs/rust-lang/std-dev-guide.json

@@ -0,0 +1,12 @@
+{
+    "groups": {
+        "all": [
+            "@joshtriplett",
+            "@yaahc",
+            "cuviper",
+            "Amanieu",
+            "@m-ou-se"
+        ]
+    },
+    "new_pr_labels": ["S-waiting-on-review"]
+}