ibc-proto version bump

[adizere]

Crate

ibc-proto

Summary of Bug

Context: Attempting to publish on crates.io the newest version of crate ibc, v0.1.1. We wanted to minimize the number of crates which go through this minor release, so decided not to bump the version ibc-proto and let this one sit at its current version 0.7.0.

Problem: Not possible to release ibc without bumping the version of crate ibc-proto. This is because both ibc and ibc-proto depend on tendermint-proto, which was updated to 0.18.1 in ibc.

The precise error is:

Attempting dry run of publishing crate ibc...
    Updating crates.io index
   Packaging ibc v0.1.1 (/Users/adi/Hammers/ibc-rs/modules)
   Verifying ibc v0.1.1 (/Users/adi/Hammers/ibc-rs/modules)
error: failed to verify package tarball
Caused by:
  failed to select a version for `tendermint-proto`.
      ... required by package `ibc-proto v0.7.0`
      ... which is depended on by `ibc v0.1.1 (/Users/adi/Hammers/ibc-rs/target/package/ibc-0.1.1)`
  versions that meet the requirements `=0.18.0` are: 0.18.0

Consolidation of ibc-proto

The present issue raises a question: whether we shouldn't consider moving domain types and their implementation altogether into crate ibc-proto. This question may be tackled with https://github.com/informalsystems/ibc-rs/issues/425.

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