Make getopts optional #10
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This PR mainly gates getopts as a default feature, so if jsonxf is used as a library, getopts won't be included in user's Cargo.lock.
Besides I explicitly set edition to 2021, update the Cargo.lock and fix the README.
But I bump the jsonxf version to v0.1.2, so would you mind making a release on crates.io?