BREAKING CHANGE: $ionicPopup.show()'s button onTap function has changed.
When using `$ionicPopup.show()`, previously a button's onTap function
would only result in closing the popup and resolving the promise if the
`onTap(event)` function returned a truthy value.
Now, a button's onTap event will *always* close the popup and resolve
the popup's promise, no matter the return value, by default. The only
way to prevent the popup from closing is to call
`event.preventDefault()`.
Change your code from this:
```js
$ionicPopup.show({
buttons: [{
onTap: function(event) {
if (!shouldClosePopup) {
return false;
}
}
}]
});
```
To this:
```js
$ionicPopup.show({
buttons: [{
onTap: function(event) {
if (!shouldClosePopup) {
event.preventDefault();
}
}
}]
});
```
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