Fix build for latest tendermint-rs master

[romac]

Closes: #XXX

Description

Fix build for latest tendermint-rs master.

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For contributor use:

• Unit tests written
• Added test to CI if applicable
• Updated CHANGELOG_PENDING.md
• Linked to Github issue with discussion and accepted design OR link to spec that describes this work.
• Updated relevant documentation (docs/) and code comments
• Re-reviewed Files changed in the Github PR explorer

[codecov-io]

Codecov Report

Merging #299 into master will increase coverage by 23.3%.
The diff coverage is 61.9%.

@@            Coverage Diff            @@
##           master    #299      +/-   ##
=========================================
+ Coverage    13.6%   37.0%   +23.3%     
=========================================
  Files          69     120      +51     
  Lines        3752    7789    +4037     
  Branches     1374    2786    +1412     
=========================================
+ Hits          513    2887    +2374     
- Misses       2618    4588    +1970     
+ Partials      621     314     -307     

Impacted Files	Coverage Δ
modules/src/events.rs	0.0% <0.0%> (ø)
modules/src/ics02_client/events.rs	0.0% <ø> (ø)
modules/src/ics02_client/raw.rs	0.0% <0.0%> (ø)
modules/src/ics03_connection/context.rs	0.0% <0.0%> (ø)
modules/src/ics03_connection/error.rs	16.6% <0.0%> (-16.7%)	⬇️
modules/src/ics04_channel/error.rs	75.0% <ø> (+50.0%)	⬆️
modules/src/ics04_channel/packet.rs	0.0% <0.0%> (ø)
modules/src/ics07_tendermint/client_def.rs	0.0% <0.0%> (ø)
modules/src/ics07_tendermint/error.rs	75.0% <ø> (+75.0%)	⬆️
modules/src/ics18_relayer/error.rs	0.0% <0.0%> (ø)
... and 218 more

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[adizere]

We'll make the Height type conversions smoother in a subsequent PR, tracked here: #300