A load of new features

Huge thanks to all the contributors!

What's Changed

• improve text normalization/escaping for preformatted/code contexts by @chrispy-snps in #104
• ignore script and style content (such as css and javascript) by @tlk in #112
• Add no css example to readme by @GeeCastro in #111
• Fix newline start in header tags by @5yato4ok in #89
• Fix newlines in tables by @carantunes in #91
• Strip text before adding blockquote markers by @andredelft in #76
• revert workaround example in README.md for <script> and <style> by @chrispy-snps in #115
• Support conversion of header rows in tables without th tag by @huuyafwww in #83
• make sure there are blank lines around table/figure captions by @chrispy-snps in #114
• Table merge cell horizontally by @xydxydxyd1 in #110

New Contributors

• @chrispy-snps made their first contribution in #104
• @tlk made their first contribution in #112
• @GeeCastro made their first contribution in #111
• @5yato4ok made their first contribution in #89
• @carantunes made their first contribution in #91
• @huuyafwww made their first contribution in #83
• @xydxydxyd1 made their first contribution in #110

Full Changelog: 0.11.6...0.12.0