Include the JIRA Description in the commit message after a blank line.

cmd/brew.go

@@ -258,7 +258,13 @@ func checkout(repo *git.Repository, issue *jira.Issue) error {
 	}
 
 	if newBranch {
-		commitMessage := fmt.Sprintf("%s. %s", issue.Key, issue.Fields.Summary)
+		// If an issue description was provided, that isn't simply a repeat of the summary, we'll automatically include
+		// it in the commit message after the break.
+		extendedDescription := ""
+		if issue.Fields.Summary != issue.Fields.Description {
+			extendedDescription = fmt.Sprintf("\n\n%s", issue.Fields.Description)
+		}
+		commitMessage := fmt.Sprintf("%s. %s%s", issue.Key, issue.Fields.Summary, extendedDescription)
 		usr, err := user.Current()
 		if err != nil {
 			return err

go.mod

@@ -16,3 +16,5 @@ require (
 	golang.org/x/crypto v0.0.0-20190510104115-cbcb75029529 // indirect
 	gopkg.in/src-d/go-git.v4 v4.12.0
 )
+
+go 1.13