Support URLs with spaces in them

[AlasdairGray]

When testing a live deployment of Bioschemas I found that the BMUSE web service does not support URLs with character encoded spaces in them, e.g. https://enanomapper.github.io/tutorials/BrowseOntology/Tutorial%20browsing%20eNM%20ontology.html

Trying with BMUSE web service https://swel.macs.hw.ac.uk/scraper/getRDF?url=https://enanomapper.github.io/tutorials/BrowseOntology/Tutorial%20browsing%20eNM%20ontology.html&output=jsonld returns the following error

{
    "result": "error",
    "message": "must supply 1 *valid* url"
}