Update COPYING

Convert to wikitext because of bug https://bugzilla.wikimedia.org/show_bug.cgi?id=66767

Follow up to commit https://github.com/SemanticMediaWiki/SemanticResultFormats/commit/f9036277d6a6c796b41b25af05ba2c3559382857
Update COPYING

Fix typo
Fix GraphViz package name (from mediawiki/graphviz to mediawiki/graph-viz).
Merge branch 'support-graphviz-1.1+'
Merge remote-tracking branch 'upstream/master'