Add 'use strict' for Node 4 compatibility

jonathantneal · jonathantneal · commit 7c3f6b6d640b · 2017-09-19T11:13:59.000-04:00
diff --git a/index.js b/index.js
@@ -1,3 +1,5 @@
+'use strict';
+
 // external tooling
 const postcss   = require('postcss');
 const transform = require('postcss-nesting/lib/transform');

Original file line number	Diff line number	Diff line change
`@@ -1,3 +1,5 @@`
	`1`	`+'use strict';`
	`2`	`+`
`1`	`3`	`// external tooling`
`2`	`4`	`const postcss = require('postcss');`
`3`	`5`	`const transform = require('postcss-nesting/lib/transform');`