Add a blur method

You need this when testing focus events.

README.md

@@ -186,6 +186,10 @@ Accepts a query selector string that resolves to an element or an element.  Call
 
 Accepts a query selector string that resolves to an element or an element.  Calls `element.focus()` followed by a `t.delay()`.
 
+### `await t.blur(elementOrQuerySelector, [msg])`
+
+Accepts a query selector string that resolves to an element or an element.  Calls `element.blur()` followed by a `t.delay()`.
+
 ### `await t.type(string, [event], [msg])`
 
 Dispatches `new window.KeyboardEvent` defaulting to the `keydown` event, for each character in `string`.  Helpful for typing into the currently focused element on screen.  This helper is a WIP, and doesn't work everywhere.  Includes a `t.delay()` call so updates are rendered every keypress.

index.js

@@ -97,6 +97,11 @@ function create (delay, fn) {
         toElement(stringOrElement).focus()
         return t.delay().then(() => t.pass(msg))
       },
+      blur (stringOrElement, msg) {
+        msg = msg || `Blurred from ${typeof stringOrElement === 'string' ? stringOrElement : 'element'}`
+        toElement(stringOrElement).blur()
+        return t.delay().then(() => t.pass(msg))
+      },
       async type (str, event, msg) {
         if (typeof event === 'string' && !msg) {
           msg = event