Bump version to 1.4.0, fix packaging (#558)

Author: sitingren

Diff for: setup.py

@@ -45,7 +45,7 @@
 # version should use the format 'x.x.x' (instead of 'vx.x.x')
 setup(
     name='vertica-python',
-    version='1.3.8',
+    version='1.4.0',
     description='Official native Python client for the Vertica database.',
     long_description="vertica-python is the official Vertica database client for the Python programming language. Please check the [project homepage](https://github.com/vertica/vertica-python) for the details.",
     long_description_content_type='text/markdown',

Diff for: vertica_python/__init__.py

@@ -56,7 +56,7 @@
            'OperationalError', 'ProgrammingError']
 
 # The version number of this library.
-version_info = (1, 3, 8)
+version_info = (1, 4, 0)
 __version__ = '.'.join(map(str, version_info))
 
 # The protocol version (3.16) implemented in this library.