Update instructions and add comment.

GaryHughes · GaryHughes · commit 36b8be9415f8 · 2020-06-16T18:40:05.000+10:00
diff --git a/README.md b/README.md
@@ -6,7 +6,7 @@ Let's suppose you have a workflow with a job in it that at the end uploads an ar
 
 ## Usage
 
-> You need to specify `commit` or `pr` input.
+> If `commit` or `pr` is not specified then the artifact from the most recent run will be downloaded.
 
 ```yaml
 - name: Download artifact
diff --git a/main.js b/main.js
@@ -74,6 +74,8 @@ async function main() {
                     return workflow_run.head_sha == commit
                 }
                 else {
+                    // No PR or commit was specified just return the first one. The results appear to be sorted
+                    // so the most recent is first.
                     return true
                 }
             })

Original file line number	Diff line number	Diff line change
`@@ -74,6 +74,8 @@ async function main() {`
`74`	`74`	`return workflow_run.head_sha == commit`
`75`	`75`	`}`
`76`	`76`	`else {`
	`77`	`+ // No PR or commit was specified just return the first one. The results appear to be sorted`
	`78`	`+ // so the most recent is first.`
`77`	`79`	`return true`
`78`	`80`	`}`
`79`	`81`	`})`