add bors status sets

.github/bors.toml

@@ -1,4 +1,10 @@
 block_labels = ["needs-decision"]
 delete_merged_branches = true
 required_approvals = 1
-status = ["continuous-integration/travis-ci/push"]
+status = [
+    "ci-linux (stable)",
+    "ci-linux (1.42.0)",
+    "build-other (macOS-latest)",
+    "build-other (windows-latest)",
+    "Rustfmt"
+]