ucfirst doesn't work with capitalized string

[csimpi]

Hi, thank you for this awesome plugin!

I just noticed ucfirst filter doesn't work with fully capitalized string.

Expected behavior:
hello leo => Hello Leo
HELLO LEO => Hello Leo

Current behavior:
hello leo => Hello Leo
HELLO LEO => HELLO LEO

[bjarnef]

I think the ucfirst only capitalize first character in each string and return the rest as it is.

angular-filter/dist/angular-filter.js

Line 2081 in 0bc1607

return ch.charAt(0).toUpperCase() + ch.substring(1);

<p> {{ 'foo bar baz' | ucfirst }}</p>

<!--
result:
Foo Bar Baz
-->