pr_checker: fix discovery of most recent CI (#334)

Author: richardlau

lib/pr_checker.js

@@ -201,7 +201,7 @@ class PRChecker {
     for (const [type, ci] of ciMap) {
       const name = CI_TYPES.get(type).name;
       cli.info(`Last ${name} CI on ${ci.date}: ${ci.link}`);
-      if (!lastCI || lastCI.date > ci.date) {
+      if (!lastCI || lastCI.date < ci.date) {
         lastCI = {
           typeName: name,
           date: ci.date

test/fixtures/commits_after_ci.json

@@ -39,5 +39,8 @@
   "comment": [{
     "bodyText": "CI: https://ci.nodejs.org/job/node-test-pull-request/10984/",
     "publishedAt": "2017-10-24T11:19:25Z"
+  },{
+    "bodyText": "Lite-CI: https://ci.nodejs.org/job/node-test-pull-request-lite-pipeline/10984/pipeline",
+    "publishedAt": "2017-10-22T11:19:25Z"
   }]
 }

test/unit/pr_checker.test.js

@@ -561,6 +561,7 @@ describe('PRChecker', () => {
           ['- feat: add something']
         ],
         info: [
+          ['Last Lite PR Pipeline CI on 2017-10-22T11:19:25Z: https://ci.nodejs.org/job/node-test-pull-request-lite-pipeline/10984/pipeline'],
           ['Last Full PR CI on 2017-10-24T11:19:25Z: https://ci.nodejs.org/job/node-test-pull-request/10984/']
         ]
       };