Release 0.3.0

What's Changed

• Add repository URL to package.json by @BowTiedRadone in #101
• Codebase housekeeping by @BowTiedRadone in #102
• Enable calling multiple SUT functions per invariant testing run by @BowTiedRadone in #103
• Update ts-jest to remove deprecated dependencies by @moodmosaic in #104
• Bump version to 0.3.0 by @BowTiedRadone in #106

Full Changelog: 0.2.0...0.3.0