Replace whitespace in filenames with - instead of nothing (#4593)
Replace whitespace in filenames with - instead of nothing (#4593)


playi/pxt,playi/pxt,switchinnovations/pxt,Microsoft/pxt,switch-education/pxt,Microsoft/pxt,switch-education/pxt,switchinnovations/pxt,Microsoft/pxt,Microsoft/pxt,Microsoft/pxt,switch-education/pxt,switchinnovations/pxt,playi/pxt,switch-education/pxt,playi/pxt,switch-education/pxt,switchinnovations/pxt