0.22.0-rc1

Added

• Now gitbase uses go-borges to access repositories
  • The type of files in each directory has to be specified (#867)
  • Supports new rooted repository format and separates references and objects from each repo (src-d/borges#389)

Changed

• Changed cli to be able to specify different formats (#866)

Fixed

• function: correctly transform up explode nodes (#757)
• git libraries bare or non bare format is automatically detected (#897)
• Fix bug that created multiple object cache with incorrect size (#898)
• sql/expression: handle null values in arithmetic expressions (#760)