Update package to 0.4.2.
Changelog:
- 0.3.0: Updated ASN.1 module imports to use RFC-based names
- 0.4.0: Added support for newer RFC modules and improved compatibility
- 0.4.1: Minor bug fixes
- 0.4.2: Latest stable release
Add PYPI_SOURCE_NAME since PyPI switched sdist filename to use
underscores (pyasn1_modules-0.4.2.tar.gz).
Add test.sh to verify basic functionality.
Signed-off-by: Alexandru Ardelean <alex@shruggie.ro>