Merge branch 'master' of github.com:leetcode-tools/leetcode-cli

Author: ko tainen

docs/commands.md

@@ -141,6 +141,7 @@ Navigate the quations.
         * `algorithms`
         * `database`
         * `shell`
+        * `concurrency`
     * by company (require plugin)
     * by topic (require plugin)
 * `-s` to show statistic counters of the output list.

lib/config.js

@@ -10,7 +10,8 @@ const DEFAULT_CONFIG = {
     categories: [
       'algorithms',
       'database',
-      'shell'
+      'shell',
+      'concurrency'
     ],
     langs: [
       'bash',