[ANN] PyMySQL 0.6.6 is released

[Naoki INADA]

PyMySQL 0.6.4 has regression. So I released bugfix version of PyMySQL.

Since I've made mistake when releasing, new version is 0.6.6, not 0.6.5.

# CHANGES

* Add context manager to cursor

* Fix can't encode blob that is not utf-8 on PY3. (regression of 0.6.4,

  Thanks to @wiggzz)