Mixin parentheses requirement removed

This was maybe too big a change without some kind of deprecation or conversion.
So for this version, this works again:

.mixin;

• #3582 Fix #3576 import redirects. Replace native-request with needle. (#3582) (@zaquest)
• #3583 Update rollup and other build dependencies (#3583) (@pravi)
• #3588 Roll back paren requirement on mixin calls (#3588) (@matthew-dean)