v0.2.9: Paracrawl v8, CCAligned, AI4Bharth Samanthar, ELRC-Share etc

• New datasets
  • WMT20 Tests
  • Paracrawl_v5_1 for Pashto and Khmer -English
  • NunavutHansard_v3 for Inuktitut -English
  • paracrawl_v8 and paracrawl_bonus datasets (#29)
  • ELRC-Share contributed by @kpu (#32)
  • AI4Bharath Samanathar v0.2
• New features
  • mtdata-iso -b for short outputs and crash on error input
• Fixes and improvements:
  • ISO 639-1 -> ISO 639-3 mapping bug fix e.g. nb (#24)
  • Consistent docs for the default behavior of --merge (#26)
  • broken pipe error when mtdata list | head is now handled