Remove checkout, same reason as command (#9)

Author: Peter Mounce

changelog.md

@@ -1,8 +1,14 @@
 # Changelog
 
-## 0.4.0
+## v0.4.1
 
-### Fixed
+### v0.4.1 Removed
+
+- Removed `checkout`, same reason as `command`.
+
+## v0.4.0
+
+### v0.4.0 Fixed
 
 - Allow multiple steps to use metahooks for the same hook but with different content.
 - Inject `bash` shebang and Bash Strict Mode (`set -euo pipefail`) so that if metahooks fail with errors the job halts rather than continuing.
@@ -14,7 +20,7 @@
 
   You can override those choices by setting different values (e.g. `set +o nounset`) within your metahook.
 
-### Removed
+### v0.4.0 Removed
 
 - **Breaking change** Removed support for `command` metahook.
 

hooks/checkout

@@ -7,7 +7,7 @@ A Buildkite plugin that allows running additional commands as buildkite hooks on
 ```yaml
 common: &common
   plugins:
-  - improbable-eng/metahook:
+  - improbable-eng/metahook#v0.4.1:
       post-checkout: scripts/setup.sh
       pre-exit: |
         scripts/cleanup.sh