syntax.php: deleting "getInfo"

to be replaced by a plugin.info.txt
Create plugin.info.txt

++ Why: DokuWiki relaese Binky runs into errors trying to install the plugin as "dokuwiki-highlight-master", a plugin.info.txt might help
Merge pull request #1 from hh-lohmann/fix-install-issue

For install / update under DokuWiki release Binky: plugin.info.txt instead of getInfo