[Pages] add release notes.

Signed-off-by: Eric Wang <skygragon@gmail.com>

Author: skygragon

docs/index.html

@@ -10,6 +10,7 @@
 </style>
 <center>
   <a href="./install" class="btn btn-clear">Installation</a>
+  <a href="./releases" class="btn btn-clear">Release Notes</a>
   <a href="./demo.html" class="btn btn-clear">Showcases</a>
   <a href="./commands" class="btn btn-clear">Commands</a>
   <a href="./advanced" class="btn btn-clear">Advanced Tips</a>

docs/releases.md

@@ -0,0 +1,26 @@
+---
+layout: default
+title: Release Notes
+---
+# 2.1.1
+* `show`
+	* add `-e` option to open editor for coding.
+	* add `-c` option to display source code only.
+	* remove legacy `-t` `-d` options.
+	* fix bad alignment in colorful output.
+* `list`
+	* enhance `-t` option to support multiple tags, e.g. `leetcode list -t google -t array`
+	* support latest `company` plugin to filter questions by tags like `array` or `dynamic programming`
+* config
+	* add `EDITOR` to set default editor.
+* fix `--no-color` bug.
+
+
+# 2.1.0
+* `show`
+	* fix "unknown language" error due to recent API changes on leetcode.com.
+	* add `kotlin` language.
+* `cache`
+	* remove `-a` option, now `leetcode cache -d` will directly clear all cache.
+	* add keyword match, e.g. `leetcode cache 537` will only show the cache for question 537.
+* update most libray depedencies.