Add Cargo.lock to the .gitignore
Add Cargo.lock to the .gitignore


Former-commit-id: 64517b450790b416ab5f00bb39946338d23867af
alekseysidorov/exonum,alekseysidorov/exonum,exonum/exonum,exonum/exonum,alekseysidorov/exonum,exonum/exonum,alekseysidorov/exonum,exonum/exonum