Let bors to cleanup branches

1 files changed, 1 insertions, 0 deletions

diff --git a/bors.toml b/bors.toml
index 4e6e85f45..ee7961784 100644
--- a/bors.toml
+++ b/bors.toml
@@ -2,3 +2,4 @@ status = [
   "continuous-integration/travis-ci/push",
   "continuous-integration/appveyor/branch"
 ]
+delete_merged_branches = true