[Release] v0.7.9

[hizzgdev]

What's Changed

• [Bugfix] fix bug that the screenshot is broken when jsmind is zoomed by @hizzgdev in [Bugfix] fix bug that the screenshot is broken when jsmind is zoomed #553
• [Bugfix] update index after remove node by @hizzgdev in [Bugfix] update index after remove node #554

Full Changelog: v0.7.8...v0.7.9

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This discussion was created from the release v0.7.9.

[hizzgdev]

非常感谢 @shuanglei7 , @mxq-crystal 报告了这两个 bug #551 & #552 。你们的认真和仔细令我非常感动！