Set version to 0.4.2. (#314)

Author: arostamianfar

setup.py

@@ -45,7 +45,7 @@
 
 setuptools.setup(
     name='gcp_variant_transforms',
-    version='0.4.1',
+    version='0.4.2',
     description=('Tool for transforming and processing VCF files in a '
                  'scalable manner based on Apache Beam'),
     author='Google',