Upgrade tendermint-rs to v0.11 (+ other crate upgrades)

Includes the following crate updates, which match versions with or are
otherwise necessitated by the `tendermint-rs` upgrade:

- `tendermint` => v0.11-ish
- `chacha20poly1305` => v0.3
- `signatory` => v0.17
- `uuid` => v0.8
- `yubihsm` => v0.30

.circleci/config.yml

@@ -9,10 +9,10 @@ jobs:
     - restore_cache:
         key: cache-2019-06-05-v0 # bump save_cache key below too
     - run:
-        name: Install Rust 1.36.0 # TODO: update Rust in the upstream Docker image
+        name: Install Rust 1.39.0 # TODO: update Rust in the upstream Docker image
         command: |
-          rustup toolchain install 1.36.0
-          rustup default 1.36.0
+          rustup toolchain install 1.39.0
+          rustup default 1.39.0
           rustup component add rustfmt
           rustup component add clippy
     - run: