CyC2018 7e20f4784d Update MySQL.md ...

调整配图的配色和画法：换成更浅的蓝、青、紫和暖灰，去掉阴影，方框加同色细描边，箭头改为实心。

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diagram

Update MySQL.md

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hooks

Add tools/hooks/pre-commit

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watermark.py

Add tools/watermark.py

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