chore: release version v31.0.2

Author: Alan Shaw

CHANGELOG.md

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+<a name="31.0.2"></a>
+## [31.0.2](https://github.com/ipfs/js-ipfs-http-client/compare/v31.0.1...v31.0.2) (2019-05-16)
+
+
+### Bug Fixes
+
+* error handling for refs/refs local ([#997](https://github.com/ipfs/js-ipfs-http-client/issues/997)) ([391351d](https://github.com/ipfs/js-ipfs-http-client/commit/391351d))
+
+
+
 <a name="31.0.1"></a>
 ## [31.0.1](https://github.com/ipfs/js-ipfs-http-client/compare/v31.0.0...v31.0.1) (2019-05-15)