Update SRF 'format=graph' to use GraphViz extension version 1.1+.
Update SRF composer.json to suggest mediawiki/graphviz.
Change "global $wgParser" to "$GLOBALS['wgParser']" (1 line).
Fix GraphViz package name (from mediawiki/graphviz to mediawiki/graph-viz).
Merge branch 'support-graphviz-1.1+'
Merge remote-tracking branch 'upstream/master'
Merge pull request #46 from welterkj/master

Update SRF 'format=graph' to use GraphViz extension version 1.1+.