Release v0.2.2

This is a minor update with a couple of bug fixes.

• f951f22 Release v0.2.2 (#31) - by @github
• 2ad4f71 Merge pull request #30 from fedorlitau/fix-slice-range-error - by @github
• b92d1c9 Fix "slice bounds out of range" error in memoryMetric.selectPoints() - by @fedor Litau
• 9034eef Avoid panic when inserting out-of-order points in spite of one partition - by @nakabonne