Prepare setup.py for release of version 0.7.0. (#469)

Author: tneymanov

setup.py

@@ -42,7 +42,7 @@
 
 setuptools.setup(
     name='gcp_variant_transforms',
-    version='0.6.1',
+    version='0.7.0',
     description=('Tool for transforming and processing VCF files in a '
                  'scalable manner based on Apache Beam'),
     author='Google',