Update changelog with 3.1.0 info

Update changelog with 2.15.0 info

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Merge pull request SAML-Toolkits#323 from gitnik/master

Add ability to change regex for protocol check

Release 2.13.0

Release 2.12.0

Release 2.11.0

Release 2.10.7

Release 2.10.6

Release 2.10.5