Merge pull request #2933 from metomi/prepare-2.6.0

Prepare release: 2.6.0

Merge pull request #2930 from metomi/prepare-2.5.1

Prepare release: 2.5.1

Merge pull request #2912 from metomi/prepare-2.5.0

Prepare release: 2.5.0

Merge pull request #2878 from metomi/prepare-2.4.2

Prepare release: 2.4.2

Merge pull request #2857 from metomi/prepare-2.4.1

Prepare release: 2.4.1

Merge pull request #2844 from metomi/prepare-2.4.0

Prepare release: 2.4.0

Merge pull request #2829 from metomi/prepare-2.3.2

Prepare release: 2.3.2

Merge pull request #2798 from metomi/prepare-2.3.1

Prepare release: 2.3.1

Merge pull request #2790 from metomi/prepare-2.3.0

Prepare release: 2.3.0

Merge pull request #2755 from metomi/prepare-2.2.0

Prepare release: 2.2.0