add flexmark-ext-resizable-image#489

vsch merged 14 commits intovsch:mastervsch/flexmark-java:masterfrom

sparksparrow:Make-support-for-setting-image-size-and-relative-paths-to-imagessparksparrow/flexmark-java:Make-support-for-setting-image-size-and-relative-paths-to-imagesCopy head branch name to clipboard