Add pretty-format-json hook to pre-commit config

Added pretty-format-json hook with autofix and indent options.

Author: mxr

.pre-commit-config.yaml

@@ -4,6 +4,8 @@ repos:
     hooks:
     -   id: trailing-whitespace
     -   id: end-of-file-fixer
+    -   id: pretty-format-json
+        args: [--autofix, --indent=2]
     -   id: check-yaml
     -   id: debug-statements
     -   id: double-quote-string-fixer