Invalid string literal in material test case: fail-an_optional_material_fails_if_no_value_matches.ifc

[andyward]

The test case IFC file material/fail-an_optional_material_fails_if_no_value_matches.ifc seems to be syntactically invalid.

The IFCMATERIAL entity name should be in single quotes. i.e.

#2=IFCMATERIAL('No match',$,$);
rather than
#2=IFCMATERIAL("No match",$,$);

I'm guessing this was hand edited? In which I case I can submit a PR?