Release v2.0.0

Changes in this release:

2.0.0 (2021-08-14)

Code Refactoring

• collector: Migrate to internal ZFS CLI implementation (53b0e98), closes #7 #9 #10

Features

• performance: Execute collection concurrently per pool (ccc6f22)
• zfs: Add local ZFS CLI parsing (f5050b1)

BREAKING CHANGES

• collector: Ratio values are now properly calculated in the range
  0-1, rather than being passed verbatim.

The following metrics are affected by this change:

• zfs_pool_deduplication_ratio
• zfs_pool_capacity_ratio
• zfs_pool_fragmentation_ratio
• zfs_dataset_compression_ratio
• zfs_dataset_referenced_compression_ratio

Additionally, the zfs_dataset_fragmentation_percent metric has been
renamed to zfs_dataset_fragmentation_ratio.