[ImgBot] Optimize images

*Total -- 588.13kb -> 499.20kb (15.12%)

/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 (15.6%)
/doc/book/event/images/ApplicationEvent.png -- 82.57kb -> 71.66kb (13.22%)
/doc/book/event/images/ApplicationListener.png -- 93.29kb -> 81.07kb (13.1%)
/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%)

Signed-off-by: ImgBotApp <[email protected]>

Author: ImgBotApp