error install on yarn 1.5.1 about tui.chart

[jinwoo-kim-nhn]

Fixed sources for yarn installation errors will be released next Tuesday.

As a temporary workaround, modify the raphael version of the last line of package.json to use it immediately.

  "dependencies": {
    "raphael": "https://github.com/nhnent/raphael.git#2.2.0-c",
    "tui-code-snippet": "^1.2.5"
  }

[kyuwoo-choi]

issue reported on nhn/tui.editor#96

[jinwoo-kim-nhn]

It is changed.