Add more related projects to the readme

Author: sindresorhus

readme.md

@@ -32,6 +32,10 @@ semverRegex().exec('unicorn 1.0.0 rainbow')[0];
 ## Related
 
 - [find-versions](https://github.com/sindresorhus/find-versions) - Find semver versions in a string
+- [latest-semver](https://github.com/sindresorhus/latest-semver) - Get the latest stable semver version from an array of versions
+- [to-semver](https://github.com/sindresorhus/to-semver) - Get an array of valid, sorted, and cleaned semver versions from an array of strings
+- [semver-diff](https://github.com/sindresorhus/semver-diff) - Get the diff type of two semver versions: `0.0.1` `0.0.2` → `patch`
+- [semver-truncate](https://github.com/sindresorhus/semver-truncate) - Truncate a semver version: `1.2.3` → `1.2.0`
 
 
 ## License