Update superagent

This release contains the latest version of superagent

Breaking changes

• Dropped support for Node 0.x and Node 4
• If you rely on undefined in query-string values being sent literally as the text "undefined", switch to checking for missing value instead. ?key=undefined is now ?key (without a value).
• In Internet Explorer, ensure that you have a polyfill that adds a global Promise object.

Fix loading status

1.0.3

Update dependencies

1.0.2

Fix render

Perform new request only if props are changed

First release

1.0.0