Found 4 link issues

[github-actions[bot]]

Link issues by awesome_bot

Line	Status	Link
18	Error	https://mailchi.mp/6a498018d9ef/mageres Failed to open TCP connection to mailchi.mp:443 (getaddrinfo: Temporary failure in name resolution)
90	301	https://www.packtpub.com/product/not-set/9781785880766 redirects to https://www.packtpub.com/product/magento-2-beginners-guide/9781785880766
99	301	https://www.packtpub.com/product/not-set/9781785888229 redirects to https://www.packtpub.com/product/magento-2-theme-design-second-edition/9781785888229
108	301	http://www.magespeedtest.com/ redirects to https://www.magespeedtest.com/

[aleron75]

fixed in commit d5d5084