Bump version from 0.4.dev to 0.4.0

.bumpversion.cfg

 [bumpversion]
-current_version = 0.4.dev
+current_version = 0.4.0
 parse = (?P<major>\d+)(\.(?P<minor>\d+))?(\.(?P<patch>\d+))?(\.(?P<release>[a-z]+))?
-serialize =
+serialize = 
 	{major}.{minor}.{patch}.{release}
 	{major}.{minor}.{release}
 	{major}.{release}
@@ -16,7 +16,7 @@ message = Bump version from {current_version} to {new_version}
 
 [bumpversion:part:release]
 optional_value = production
-values =
+values = 
 	dev
 	production
 

datamodelvalidator/__main__.py

@@ -7,7 +7,7 @@ from .validator import Validator
 
 @click.command()
 @click.argument('path', type=click.Path(exists=True))
-@click.version_option(version='0.4.dev')
+@click.version_option(version='0.4.0')
 def validate_and_echo(path: str) -> None:
     """Performs validation of the Euclid Data Model.
 

setup.py

@@ -8,7 +8,7 @@ if sys.version_info < (3, 5):
 
 setup(
     name='datamodelvalidator',
-    version='0.4.dev',
+    version='0.4.0',
     description='Performs validation of the Euclid Data Model',
     license='LGPL-3.0+',
     packages=find_packages(exclude=('tests',)),