Node 4 compatibility

Author: bokub

index.js

@@ -29,7 +29,7 @@ function applyGradient(str, gradient, opts) {
 function multilineGradient(str, gradient, opts) {
 	const options = validateOptions(opts);
 	const lines = str.split('\n');
-	const maxLength = Math.max(gradient.stops.length, ...(lines.map(l => l.length)));
+	const maxLength = Math.max.apply(null, lines.map(l => l.length).concat([gradient.stops.length]));
 	const colors = getColors(gradient, options, maxLength);
 	const results = [];
 	for (const line of lines) {