Update README.md

Merge branch 'master' of https://github.com/huanghongxun/HMCL

Merge pull request HMCL-dev#71 from Cat7373/master

Windows 启动脚本中允许跨分区 cd

Fixed NullPointerException when minecraftArguments=null

Fixed mainClass of macAppBundle

Applied macosapp. Closes HMCL-dev#63

Supplements: 'SerializedName'

TWords in title bar can be dragged now

Fixed HMCL-dev#68

Changes logo. Closes HMCL-dev#67