Auto merge of rust-lang#3893 - rust-lang:autolabel, r=RalfJung

Automatically add/remove labels when github review (requests) are used

src/tools/miri/triagebot.toml

@@ -17,3 +17,15 @@ contributing_url = "https://github.com/rust-lang/miri/blob/master/CONTRIBUTING.m
 
 [no-merges]
 exclude_titles = ["Rustup"]
+
+[review-submitted]
+# This label is added when a "request changes" review is submitted.
+reviewed_label = "S-waiting-on-author"
+# These labels are removed when a "request changes" review is submitted.
+review_labels = ["S-waiting-on-review"]
+
+[review-requested]
+# Those labels are removed when PR author requests a review from an assignee
+remove_labels = ["S-waiting-on-author"]
+# Those labels are added when PR author requests a review from an assignee
+add_labels = ["S-waiting-on-review"]