Use min-indent (#4)

index.js

@@ -1,14 +1,14 @@
 'use strict';
+const minIndent = require('min-indent');
+
 module.exports = str => {
-	const match = str.match(/^[ \t]*(?=\S)/gm);
+	const indent = minIndent(str);
 
-	if (!match) {
+	if (indent === 0) {
 		return str;
 	}
 
-	// TODO: Use spread operator when targeting Node.js 6
-	const indent = Math.min.apply(Math, match.map(x => x.length));
 	const re = new RegExp(`^[ \\t]{${indent}}`, 'gm');
 
-	return indent > 0 ? str.replace(re, '') : str;
+	return str.replace(re, '');
 };

package.json

@@ -31,6 +31,9 @@
     "string",
     "str"
   ],
+  "dependencies": {
+    "min-indent": "^1.0.0"
+  },
   "devDependencies": {
     "ava": "*",
     "xo": "*"