Log Message:
tex-zhmetrics{,-doc}: Add version 206

These are metrics to use existing Chinese TrueType fonts in
workflows that use LaTeX & dvipdfmx, or pdfLaTeX. The fonts
themselves are not included in the package. Six font families
are supported: kai, song, lishu, fangsong, youyuan and hei. Two
encodings (GBK and UTF-8) are supported.