Make minor changes on code style to pass the eslint test

Author: aaaahern

lib/leetcode_client.js

@@ -28,15 +28,15 @@ leetcodeClient.getProblems = function(cb) {
     var problems = [];
     problemsListJson.stat_status_pairs.forEach(function(problemData) {
       var problem = {
-        state:   problemData['status'],
-        id:      problemData['stat']['question_id'].toString(),
-        name:    problemData['stat']['question__title'],
-        key:     problemData['stat']['question__title_slug'],
-        link:    config.PROBLEM_URL + problemData['stat']['question__title_slug'],
-        locked:  problemData['paid_only'],
-        level:   parseDifficulty(problemData['difficulty']['level'])
+        state:  problemData.status,
+        id:     problemData.stat.question_id.toString(),
+        name:   problemData.stat.question__title,
+        key:    problemData.stat.question__title_slug,
+        link:   config.PROBLEM_URL + problemData.stat.question__title_slug,
+        locked: problemData.paid_only,
+        level:  parseDifficulty(problemData.difficulty.level)
       };
-      var percent = parseInt(problemData['stat']['total_acs'], 10) / parseInt(problemData['stat']['total_submitted'], 10) * 100;
+      var percent = parseInt(problemData.stat.total_acs, 10) / parseInt(problemData.stat.total_submitted, 10) * 100;
       problem.percent = percent.toFixed(1).toString() + '%';
       problems.push(problem);
     });