Upgrade to sdk v0.38

[sunnya97]

Alternative close #15

If the goal is to merge gaia, then use #44

• Targeted PR against correct branch (see CONTRIBUTING.md)

• Linked to github-issue with discussion and accepted design OR link to spec that describes this work.

• Wrote tests

• Updated relevant documentation (docs/)

• Added a relevant changelog entry to the Unreleased section in CHANGELOG.md

• Reviewed Files changed in the github PR explorer

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For Admin Use:

• Added appropriate labels to PR (ex. wip, ready-for-review, docs)
• Reviewers Assigned
• Squashed all commits, uses message "Merge PR #XYZ: [title]" (coding standards)

[codecov-io]

Codecov Report

Merging #47 into master will increase coverage by 1.74%.
The diff coverage is 71.31%.

@@            Coverage Diff            @@
##           master     #47      +/-   ##
=========================================
+ Coverage   61.46%   63.2%   +1.74%     
=========================================
  Files          15      14       -1     
  Lines        1095    1098       +3     
=========================================
+ Hits          673     694      +21     
+ Misses        356     338      -18     
  Partials       66      66

Impacted Files	Coverage Δ
app/export.go	7.31% <0%> (ø)	⬆️
x/wasm/internal/keeper/test_common.go	100% <100%> (ø)	⬆️
x/wasm/internal/keeper/keeper.go	67.46% <35%> (ø)	⬆️
x/wasm/internal/keeper/querier.go	26.13% <7.14%> (+2.42%)	⬆️
x/wasm/handler.go	85.91% <81.25%> (+1.62%)	⬆️
lcd_test/helpers.go	75.53% <91.66%> (ø)	⬆️
app/app.go	88.81% <93.1%> (+0.96%)	⬆️

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[ethanfrey]

Thank you for the contribution, but I am rejecting this in favor of #44, as that merges in gaia/master and addresses all the requirements of issue #15

I feel bad closing this work, but let's try to check in on the issue better beforehand next time.