Pin versions for thrift and thrift_sasl dependencies

Version 0.14.0

Bug fixes, Hive compatibility fixes, speed improveents

Version 0.13.8. Bug fixes

Minor release to incorporate Hive SQLAlchemy fix

Do not require installing sasl and thrift_sasl

Version 0.13.5

Fixed a packaging problem for PyPI with 0.13.4, and added the correct
TSSLSocket import from thriftpy on Python 3.

Release v0.13.1

* added stopgap fix for working with nested data

Release v0.13.0

* added docstrings to user-facing API
* thriftpy compatibility fixes for Python 3
* bulk of logging is now moved to DEBUG level
* other minor fixes

Release v0.12.0

Main functional improvement is adding columnar fetching.

* New abstractions to encapsulate HS2 objects; no effect on user API
* Timestamps and Decimals are optionally parsed
* Removed deprecated functionality; package is much simpler now
* Support for columnar fetching, avoiding unnecessary repivoting of data
* Operations are now closed when cursors are closed
* Support for paramstyle=format (IMPYLA-138)
* setup.py more robust with older versions of setuptools (IMPYLA-133)
* Eliminate default socket timeout.  It must be set manually if desired. (IMPYLA-128)

Release v0.11.2

Updated README