chore: release version v0.4.0

Author: hugomrdias

CHANGELOG.md

@@ -1,3 +1,13 @@
+<a name="0.4.0"></a>
+# [0.4.0](https://github.com/ipfs/js-ipfs-utils/compare/v0.3.0...v0.4.0) (2019-09-19)
+
+
+### Features
+
+* add isElectronMain env test ([#13](https://github.com/ipfs/js-ipfs-utils/issues/13)) ([9072c90](https://github.com/ipfs/js-ipfs-utils/commit/9072c90))
+
+
+
 <a name="0.3.0"></a>
 # [0.3.0](https://github.com/ipfs/js-ipfs-utils/compare/v0.2.0...v0.3.0) (2019-09-15)