Merge pull request #136 from googlefonts/ff-fix

CSSFontFace.partial: allow fonts with spaces in filename

src/diffenator2/templates/CSSFontFace.partial.html

@@ -1,5 +1,5 @@
 @font-face{
-    src: url({{ filename }});
+    src: url("{{ filename }}");
     font-family: "{{ cssfamilyname }}";
     font-weight: {{ font_weight }};
     {% if font_stretch %}font-stretch: {{ font_stretch }};{% endif %}