Fix some lint errors

Author: poppinlp

lib/plugins/cache.js

@@ -28,16 +28,14 @@ plugin.getProblem = function(problem, cb) {
   const k = h.KEYS.problem(problem);
   const _problem = cache.get(k);
   if (_problem) {
-    // do not hit problem without html tags in desc (<pre> always exists for presenting testcase)
-    if (!_problem.desc.includes("<pre>")) {
+    if (!_problem.desc.includes('<pre>')) {
+      // do not hit problem without html tags in desc (<pre> always exists for presenting testcase)
       log.debug('cache discarded for being no longer valid: ' + k + '.json');
-    }
-    // do not hit problem without likes & dislikes (logic will be improved in new lib)
-    else if (!['likes', 'dislikes'].every(p => p in _problem)) {
+    } else if (!['likes', 'dislikes'].every(p => p in _problem)) {
+      // do not hit problem without likes & dislikes (logic will be improved in new lib)
       log.debug('cache discarded for being too old: ' + k + '.json');
-    }
-    // cache hit
-    else {
+    } else {
+      // cache hit
       log.debug('cache hit: ' + k + '.json');
       _.extendOwn(problem, _problem);
       return cb(null, problem);