onFilter event retrieves text only lowercase format

[ffaxriddinoff]

Hi everyone
I used onFilter event with filter:

$('select').multipleSelect({
filter: true,
onFilter: function (text) {
console.log(text)
}
})

that text variable always returns as lowercase. For example:
Typed: "Hello World" Result: "hello world"
Typed: "Hello WORLD" Result: "hello world"
Typed: "HELLO World" Result: "hello world"

Can you help me with that problem?

[wenzhixin]

Fixed in #609