Merge pull request #44 from buildkite-plugins/renovate/shellcheck-1.x

Update buildkite plugin shellcheck to v1.3.0

Author: toote

.buildkite/pipeline.yml

@@ -6,7 +6,7 @@ steps:
 
   - label: ":bash: Shellcheck"
     plugins:
-      shellcheck#v1.2.0:
+      shellcheck#v1.3.0:
         files: hooks/**
 
   - label: ":bash: Tests"