Fix when frozen with cx_freeze
Fix when frozen with cx_freeze

Fixes

    from weasyprint import HTML
  File "/usr/local/lib/python3.7/dist-packages/weasyprint/__init__.py", line 41, in <module>
    VERSION = __version__ = (ROOT / 'VERSION').read_text().strip()
TypeError: unsupported operand type(s) for /: 'str' and 'str'
Kozea/WeasyPrint,Kozea/WeasyPrint