pr_checker: show the pr author email and their status

Author: joyeecheung

lib/pr_checker.js

@@ -268,8 +268,8 @@ class PRChecker {
       return true;
     }
 
-    const prAuthor = pr.author.login;
-    cli.warn(`PR author is: @${prAuthor}`);
+    const prAuthor = `${pr.author.login}(${pr.author.email})`;
+    cli.warn(`PR author is a new contributor: @${prAuthor}`);
     for (const c of oddCommits) {
       const { oid, author } = c.commit;
       const hash = oid.slice(0, 7);

test/unit/pr_checker.test.js

@@ -530,7 +530,7 @@ describe('PRChecker', () => {
 
       const expectedLogs = {
         warn: [
-          ['PR author is: @pr_author'],
+          ['PR author is a new contributor: @pr_author([email protected])'],
           ['- commit e3ad7c7 is authored by [email protected]'],
           ['- commit da39a3e is authored by [email protected]']
         ]