v1.9.0

MLJBase v1.9.0

Diff since v1.8.2

For the release notes:

• Allow tuples, in addition to vectors, when specifying resampling=... in evaluate/evaluate!, and fix a mistake in the error message for invalid resampling values (#1010)

Merged pull requests:

• Allow tuples in the resampling option for evaluate (#1010) (@ablaom)
• For a 1.9 release (#1011) (@ablaom)