Bump version and update changelog.

Author: jmcarp

Diff for: CHANGELOG.rst

@@ -1,6 +1,10 @@
 Changelog
 ---------
 
+0.5.0 (2017-04-07)
+++++++++++++++++++
+* Accept engine or connection. Thanks @JacobHayes!
+
 0.4.0 (2017-03-28)
 ++++++++++++++++++
 * Expose column order in copy_from. Thanks @JacobHayes!

Diff for: postgres_copy/__init__.py

@@ -5,7 +5,7 @@
 from sqlalchemy.sql.operators import ColumnOperators
 from sqlalchemy.dialects import postgresql
 
-__version__ = '0.4.0'
+__version__ = '0.5.0'
 
 def copy_to(source, dest, engine_or_conn, **flags):
     """Export a query or select to a file. For flags, see the PostgreSQL