Bumps [cosmossdk.io/api](https://github.com/cosmos/cosmos-sdk) from 0.3.0 to 0.3.1.
<details>
<summary>Changelog</summary>
<p><em>Sourced from <a href="https://github.com/cosmos/cosmos-sdk/blob/v0.3.1/CHANGELOG.md">cosmossdk.io/api's changelog</a>.</em></p>
<blockquote>
<h2>0.3.1 (March 23, 2017)</h2>
<p>IMPROVEMENTS:</p>
<ul>
<li>CLI returns exit code 1 and logs error before exiting</li>
</ul>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li>See full diff in <a href="https://github.com/cosmos/cosmos-sdk/compare/v0.3.0...v0.3.1">compare view</a></li>
</ul>
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