Adding pad optional setting to pad the ending of decimal place, fixes

#117

README.md

@@ -35,6 +35,9 @@ _*(string)*_ Output of function (`array`, `exponent`, `object`, or `string`), de
 ### round
 _*(number)*_ Decimal place, default is `2`
 
+### pad
+_*(boolean)*_ Decimal place end padding, default is `false`
+
 ### separator
 _*(string)*_ Decimal separator character, default is `.`
 

lib/filesize.es6.js

@@ -38,14 +38,15 @@
 	function filesize (arg, descriptor = {}) {
 		let result = [],
 			val = 0,
-			e, base, bits, ceil, full, fullforms, locale, localeOptions, neg, num, output, round, unix, separator, spacer, standard, symbols;
+			e, base, bits, ceil, full, fullforms, locale, localeOptions, neg, num, output, pad, round, unix, separator, spacer, standard, symbols;
 
 		if (isNaN(arg)) {
 			throw new TypeError("Invalid number");
 		}
 
 		bits = descriptor.bits === true;
 		unix = descriptor.unix === true;
+		pad = descriptor.pad === true;
 		base = descriptor.base || 2;
 		round = descriptor.round !== void 0 ? descriptor.round : unix ? 1 : 2;
 		locale = descriptor.locale !== void 0 ? descriptor.locale : "";
@@ -149,6 +150,16 @@
 			return {value: result[0], symbol: result[1], exponent: e};
 		}
 
+		if (pad && Number.isInteger(result[0]) === false && round > 0) {
+			const x = separator || ".",
+				tmp = result[0].toString().split(x),
+				s = tmp[1] || "",
+				l = s.length,
+				n = round - l;
+
+			result[0] = `${tmp[0]}${x}${s.padEnd(l + n, "0")}`;
+		}
+
 		return result.join(spacer);
 	}