remove parachain's Cargo.lock

[guanqun]

I believe this is checked in accidentally, should remove it.

[gavofyork]

@rphmeier is this true? since it's its own crate, i thought not...

[guanqun]

I could be wrong, but why there's only one file, no other source code?

➜  substrate ‹master› tree polkadot
polkadot
└── parachain
    └── test-chains
        └── basic_add
            └── Cargo.lock

3 directories, 1 file

[rphmeier]

Indeed, it remains accidentally