README: Bump release to v0.0.4

Author: trinitronx

README.md

@@ -33,7 +33,7 @@ Example `.pre-commit-config.yaml`:
 
 ```yaml
 - repo: https://github.com/LyraPhase/pre-commit-digitalocean.git
-  rev: v0.0.3
+  rev: v0.0.4
   hooks:
   - id: doctl-app-spec-validate
     args: [--verbose]