[ImgBot] Optimize images

[imgbot[bot]]

Beep boop. Your images are optimized!

Your image file size has been reduced by 15% 🎉

Details

File	Before	After	Percent reduction
/doc/book/深入spring/image/image-20201227200314479.png	24.41kb	13.68kb	43.94%
/doc/book/深入spring/image/image-20201227202136137.png	43.60kb	25.73kb	40.97%
/doc/book/深入spring/image/image-20201227200347947.png	25.72kb	19.75kb	23.22%
/doc/book/bean/factory/xml/NamespaceHandler/images/NamespaceHandler.png	30.20kb	25.49kb	15.60%
/doc/book/event/images/ApplicationEvent.png	82.57kb	71.66kb	13.22%
/doc/book/event/images/ApplicationListener.png	93.29kb	81.07kb	13.10%
/doc/deep_spring/IoC/images/AnnotationConfigApplicationContext.png	60.65kb	54.26kb	10.53%
/doc/book/深入spring/images/ClassPathXmlApplicationContext.png	49.53kb	44.42kb	10.31%
/doc/book/context/annotation/images/AnnotatedGenericBeanDefinition.png	38.80kb	35.00kb	9.78%
/doc/deep_spring/IoC/images/ClassPathXmlApplicationContext.png	69.90kb	63.53kb	9.11%
/doc/bool-expression/ExpressionParser/images/ExpressionParser.png	12.92kb	11.89kb	7.98%
/doc/book/context/annotation/images/ClassPathBeanDefinitionScanner.png	17.08kb	15.77kb	7.64%
/doc/book/core/io/ResourcePatternResolver/images/PathMatchingResourcePatternResolver.png	11.07kb	10.28kb	7.09%
/doc/book/bean/factory/xml/BeanDefinitionDocumentReader/images/DefaultBeanDefinitionDocumentReader.png	8.48kb	7.91kb	6.71%
/doc/book/深入spring/images/PathMatchingResourcePatternResolver.png	8.43kb	7.89kb	6.38%
/doc/book/bean/factory/xml/NamespaceHandlerResolver/images/DefaultNamespaceHandlerResolver.png	11.48kb	10.84kb	5.57%
Total :	588.13kb	499.20kb	15.12%

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