Prepare 0.29.1 release of tendermint

[hdevalence]

This commit only bumps the patch version of the tendermint crate; since it's compatible and will be auto-selected, it didn't seem important to bump all of the versions of all of the other crates, or bump their dependency specifications.

[thanethomson]

The trouble with only bumping the one crate's patch version is, say you need to make a patch update to a different crate at a later stage (e.g. the tendermint-abci crate) after having pushed the v0.29.1 tag to cut the release - what tag do you push to the Git repo to trigger the next release? Then you'll already have used v0.29.1.

This is partly why we version all crates in lockstep.

The only other alternative is to delete the v0.29.1 tag and push it again at a later stage if you bump a different crate's patch version to v0.29.1 and want to trigger its release. We haven't tested this approach, however, with our current release script.

[hdevalence]

Sounds reasonable, I replaced all of the 0.29.0 versions by 0.29.1 instead.

[xla]

🦾

[thanethomson]

LGTM! Feel free to merge and then tag whenever you're ready.