Update sqlalchemy to 1.2.2

[pyup-bot]

There's a new version of sqlalchemy available.
You are currently using 1.2.1. I have updated it to 1.2.2

These links might come in handy: PyPI | Changelog | Homepage

Changelog

1.2.2

:released: January 24, 2018

.. change::
:tags: bug, mssql
🎟️ 4164

   Added ODBC error code 10054 to the list of error
   codes that count as a disconnect for ODBC / MSSQL server.

.. change::
:tags: bug, orm
🎟️ 4171

   Fixed 1.2 regression regarding new bulk_replace event
   where a backref would fail to remove an object from the
   previous owner when a bulk-assignment assigned the
   object to a new owner.

.. change::
:tags: bug, oracle
🎟️ 4163

   The cx_Oracle dialect now calls setinputsizes() with cx_Oracle.NCHAR
   unconditionally when the NVARCHAR2 datatype, in SQLAlchemy corresponding
   to sqltypes.Unicode(), is in use.  Per cx_Oracle's author this allows
   the correct conversions to occur within the Oracle client regardless
   of the setting for NLS_NCHAR_CHARACTERSET.

.. change::
:tags: bug, mysql

   Added more MySQL 8.0 reserved words to the MySQL dialect
   for quoting purposes.  Pull request courtesy
   Riccardo Magliocchetti.

.. changelog::

Got merge conflicts? Close this PR and delete the branch. I'll create a new PR for you.

Happy merging! 🤖