Selecting minified JS option causes bugs on ie8

[sukhrajghuman]

What happened

When the JS is minified option is selected as true, the side-nav doesn't open or close in ie8 on smaller devices

"js": {
		"minified": true,
		"modules": false,
		"location": "docs/js/",
		"name": "script.js"
	},

What I expected to happen

I expected the side-nav to open and close when I click it

Reproducing

• Pancake version: v1.2.3

Steps to reproduce:

1. As an example, run uikit-starter project on ie8 and try to open/close the accordion

2. Then try setting the minified option to false

[alex-page]

Should be this line of code:

pancake/packages/pancake-js/src/js.js

Line 40 in 21d154d

const jsCode = UglifyJS.minify( js );