v8.20

New in version 8.20

• Added UV index variable
• Fixed B13211 length (#239)
• Added variables 025194 011211 011212 011213 011214 011215 011216
• Added dbadb import --domain-errors={unset|clamp|tag}. tag is only
  available when compiling with wreport from version 3.29. (#241)
• Added Lifted, virtual T and Skin Temperature variables
• Added support for python 3.9 in nose2 tests
• Dropped support for nose1
• Added dbadb import --domain-errors={unset|clamp}. clamp is only available
  when compiling with wreport from version 3.28. (#241)
• Fixed querying by datetime extremes in explorer (#242)
• Added alternative meson build system