enhancement request: could we replace "This Glyphs source" with an actual file name?

If the file name is readily available, please replace "This Glyphs source" with an actual file name in the warning message.

It would save me looking at the log and backtracking to the name.

If not easy to access the file name when the message is generated, the please close this github issue.

makeout-201608031551.txt:WARNING: This Glyphs source was generated with an outdated version of Glyphs. The resulting UFOs may be incorrect.
makeout-201608031551.txt:WARNING: This Glyphs source was generated with an outdated version of Glyphs. The resulting UFOs may be incorrect.
makeout-201608031551.txt:WARNING: This Glyphs source was generated with an outdated version of Glyphs. The resulting UFOs may be incorrect.
makeout-201608031551.txt:WARNING: This Glyphs source was generated with an outdated version of Glyphs. The resulting UFOs may be incorrect.
makeout-201608031551.txt:WARNING: This Glyphs source was generated with an outdated version of Glyphs. The resulting UFOs may be incorrect.
makeout-201608031551.txt:WARNING: This Glyphs source was generated with an outdated version of Glyphs. The resulting UFOs may be incorrect.
makeout-201608031551.txt:WARNING: This Glyphs source was generated with an outdated version of Glyphs. The resulting UFOs may be incorrect.
makeout-201608031551.txt:WARNING: This Glyphs source was generated with an outdated version of Glyphs. The resulting UFOs may be incorrect.
makeout-201608031551.txt:WARNING: This Glyphs source was generated with an outdated version of Glyphs. The resulting UFOs may be incorrect.
makeout-201608031551.txt:WARNING: This Glyphs source was generated with an outdated version of Glyphs. The resulting UFOs may be incorrect.
makeout-201608031551.txt:WARNING: This Glyphs source was generated with an outdated version of Glyphs. The resulting UFOs may be incorrect.