Update logseq.md for version 0.5.2
Update logseq.md for version 0.5.2

Updates (as of desktop app 0.5.2):
* Fenced code blocks: work both with indicated language and without
* Highlight: `hello ==beautiful word==` highlights as expected
* Copy&pasting emoji works (including emojis from https://emojipedia.org/emoji-13.0/, emoji-14.0 does not work but that is most likely me missing the fonts for now as it has been just approved by unicode)
* HTML: Supported tags include (at least): `p`, `div`, `a`, `img`, `b`, `em`, `sup`, `sub`, `table`, `tr`, `td`, `th`, `ul`, `ol`, `li`, `h1`..`h5` and very likely others I have not tested
mattcone/markdown-guide,mattcone/markdown-guide