Multiple branches having the same name and version used by other crates

[haraldh]

Other crates like https://github.com/matter-labs/franklin-crypto are depending on this crate on multiple branches.
Because those branches, namely dev and snark-wrapper are using the same crate name and version, this prevents a cargo vendor of e.g. https://github.com/matter-labs/zksync-era

See matter-labs/zksync-era#1086 matter-labs/franklin-crypto#65

Recommendation: change the package name to ${orig}-${branchname} in the branches in question, or change the version.