Prepare release 3.1

added 1 commit

• a3e8b5ce - Bump version to 3.1.1.dev0

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added 10 commits

• a3e8b5ce...ebd85034 - 7 commits from branch master
• 75154df0 - Update changelog
• dfe82616 - Bump version to 3.1
• eeba853d - Bump version to 3.1.1.dev0

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mentioned in commit ad8e5a3b

merged