use local pre-commit hook for swift-format (#272)

Author: nwh

.pre-commit-config.yaml

@@ -1,6 +1,8 @@
 repos:
-- repo: https://github.com/slessans/pre-commit-swift-format
-  rev: "fd627de92bdf84a75c924ed95691336d14e94cf1"
+- repo: local
   hooks:
     - id: swift-format
-      args: ["--configuration", ".swift-format"]
+      name: swift-format
+      language: system
+      entry: swift-format --in-place
+      files: '\.swift$'