Drop Python 2.7 compatibility
v0.11.2 is the last version which supports Python 2.7 since the implementation of the new database API v2 will require a lot of code, it saves time to skip compat-code.
v0.11.2 is the last version which supports Python 2.7 since the implementation of the new database API v2 will require a lot of code, it saves time to skip compat-code.