Merge pull request python-cas#73 from python-cas/release-1.7.2

🔖 release version 1.7.2

Merge pull request python-cas#67 from python-cas/release-1.7.1

🔖 release version 1.7.1

Merge pull request python-cas#64 from python-cas/release-1.7.0

🔖 release version 1.7.0

Release 1.6.0

Release 1.5.0

Release 1.4.0

Release 1.3.0

Release 1.2.0

update version

prepare 1.0.0 release