Add Python triple-quoted strings "known failure" (#1449)
Add Python triple-quoted strings "known failure" (#1449)

* Add example of failure in Python parser
PrismJS/prism,PrismJS/prism,CupOfTea696/prism,byverdu/prism,PrismJS/prism,CupOfTea696/prism,PrismJS/prism,byverdu/prism,CupOfTea696/prism,byverdu/prism,CupOfTea696/prism,CupOfTea696/prism,byverdu/prism,byverdu/prism,PrismJS/prism