EasyLogger release 2.2.0

• Add new feature: set output level dynamically by module. Thx by @MRkuan
• Fix some bugs by @tianlongqin @kingjason2009

EasyLogger release 2.1.0

• add hexdump feature
• add file log featrue
• fixed some bugs

First release

1、【更新】文档中几处拼写错误。

Signed-off-by: armink <armink.ztl@gmail.com>