update README

Author: pmuellr

README.md

@@ -328,20 +328,22 @@ changes
 **1.2.4** - 2021/04/03
 
 - upgrade most dependencies, but not CoffeeScript, since the latest
-  version generates code that can't be run in older versions of node
+  version generates code that can't be run in older versions of node - [pr #50][]
 
 - change to call `yaml.load()` instead of `yaml.safeLoad()` since it's no
-  longer supported, noticed via an error message:
+  longer supported, noticed via an error message: - [pr #50][]
 
   ```
   Error: Function yaml.safeLoad is removed in js-yaml 4. Use yaml.load instead, which is now safe by default.
   ```
 
+[pr #50]: https://github.com/cloudfoundry-community/node-cfenv/pull/50
+
 **1.2.3** - 2020/07/24
 
-- remove `.cfignore` file
+- remove `.cfignore` file - [commit #02bb92d][]
 
-[pr #41]: https://github.com/cloudfoundry-community/node-cfenv/pull/41
+[commit #02bb92d]: https://github.com/cloudfoundry-community/node-cfenv/commit/02bb92dacf5f59244b188dae11fd2fe732c4940e
 
 **1.2.2** - 2019/03/26