add list of all "whitespace" characters to be checked
add list of all "whitespace" characters to be checked

issue #608

graphicore/fontbakery,graphicore/fontbakery,moyogo/fontbakery,graphicore/fontbakery,googlefonts/fontbakery,moyogo/fontbakery,googlefonts/fontbakery,moyogo/fontbakery,googlefonts/fontbakery