Adds usernames to formatDescription (#28)

* Adds usernames to formatDescription

* Formatting

Author: kamronbatman

index.js

@@ -31,6 +31,7 @@ const formatDescription = (description) => {
             const nlCount = (ws.match(/\n/g) || []).length
             return nlCount >= 2 ? '\n\n' : '\n'
         })
+        .replace(/@(\S+)/g, (match, name) => { return `[@${name}](https://github.com/${name})` })
         .trim()
 
     if (core.getBooleanInput('reduce_headings')) {
@@ -174,4 +175,4 @@ async function run () {
 
 run()
     .then(() => {core.info('Action completed successfully')})
-    .catch(err => {core.setFailed(err.message)})
+    .catch(err => {core.setFailed(err.message)})