Espruino 1v88 released

@Gordon, for an original Espruino board (v1.4b) running 1v89, code entered right after a reset of an example right out of Mozilla Developer Network Arrow Function page ...

var max=(a,b)=>(a>b)?a:b;
max; // returns function (b) { native code }
max(4,6);  // hangs indefinitely???

Hangs, and usually eventually generates an out of memory error message.

function max(a,b) { return (a>b)?a:b; };  // works fine