Update to 0.9

[ethanfrey]

This updates cosmos-sdk-0.39 branch to v0.9.0-alpha2 release, so we can code with minimal breaking changes

• 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 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 #148 into cosmos-sdk-0.39 will increase coverage by 30.84%.
The diff coverage is 50.00%.

@@                 Coverage Diff                  @@
##           cosmos-sdk-0.39     #148       +/-   ##
====================================================
+ Coverage            30.98%   61.83%   +30.84%     
====================================================
  Files                   22       20        -2     
  Lines                 3653     1766     -1887     
====================================================
- Hits                  1132     1092       -40     
+ Misses                2426      580     -1846     
+ Partials                95       94        -1     

Impacted Files	Coverage Δ
x/wasm/internal/types/types.go	0.00% <0.00%> (ø)
x/wasm/internal/keeper/keeper.go	86.22% <85.71%> (ø)
x/wasm/handler.go	57.94% <100.00%> (-0.62%)	⬇️
x/wasm/internal/keeper/test_common.go	84.16% <100.00%> (+0.98%)	⬆️
app/app.go	89.15% <0.00%> (-4.08%)	⬇️
x/wasm/internal/keeper/handler_plugin.go	72.15% <0.00%> (-0.47%)	⬇️
app/genesis.go	0.00% <0.00%> (ø)
x/wasm/internal/types/msg.go	44.33% <0.00%> (ø)
x/wasm/internal/types/codec.go	100.00% <0.00%> (ø)
... and 6 more

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