Release v0.6.8

What's Changed

• docs: correct the packed-repeated entry for the v0.6.7 decoder by @svc-finitelabs[bot] in #24
• fix: handle NaN and infinity in the float and double codecs by @svc-finitelabs[bot] in #25
• fix: correct the frexp fallback and drive it from generated vectors by @svc-finitelabs[bot] in #26
• fix: sign the 32-bit codecs and cover the wire format against the reference by @svc-finitelabs[bot] in #27
• fix: emit fields and map entries in a stable order by @derek-miller in #29
• fix: handle subnormals in both float codecs and round ties to even by @svc-finitelabs[bot] in #30

Full Changelog: v0.6.7...v0.6.8