Update contract admin

[alpe]

Resolves #117

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• Linked to Github issue with discussion and accepted design OR link to spec that describes this work.
• Wrote tests
• Updated relevant documentation (docs/)
• Added relevant godoc comments.
• Added a relevant changelog entry to the Unreleased section in CHANGELOG.md
• Re-reviewed Files changed in the Github PR explorer

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For admin use:

• Added appropriate labels to PR (ex. WIP, R4R, docs, etc)
• Reviewers assigned
• Squashed all commits, uses message "Merge pull request #XYZ: [title]" (coding standards)

[codecov-commenter]

Codecov Report

Merging #124 into 0.9 will decrease coverage by 0.28%.
The diff coverage is 49.01%.

@@            Coverage Diff             @@
##              0.9     #124      +/-   ##
==========================================
- Coverage   62.36%   62.08%   -0.29%     
==========================================
  Files          20       20              
  Lines        1714     1762      +48     
==========================================
+ Hits         1069     1094      +25     
- Misses        553      576      +23     
  Partials       92       92              

Impacted Files	Coverage Δ
x/wasm/handler.go	57.94% <0.00%> (-10.95%)	⬇️
x/wasm/internal/keeper/genesis.go	0.00% <0.00%> (ø)
x/wasm/internal/types/msg.go	44.33% <57.89%> (+2.96%)	⬆️
x/wasm/internal/keeper/keeper.go	86.32% <100.00%> (+0.61%)	⬆️
x/wasm/internal/types/codec.go	100.00% <100.00%> (ø)
lcd_test/helpers.go	76.25% <0.00%> (+0.71%)	⬆️

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[ethanfrey]

Looks good.

Two mainly stylistic issues. Feel free to address them as you feel fit and then merge.