fix: Remove unecessary whitespace from SVG contents

```js
/* BEFORE */
{ circle: "\n  <circle cx=\"12\" cy=\"12\" r=\"10\"></circle>\n" }

/* AFTER */
{ circle: "<circle cx=\"12\" cy=\"12\" r=\"10\"></circle>" }
```

bin/__tests__/build-icons-object.test.js

@@ -3,9 +3,9 @@ import buildIconsObject from '../build-icons-object';
 
 const SVG_FILES = {
   'icon1.svg':
-    '<svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><line x1="23" y1="1" x2="1" y2="23" /><line x1="1" y1="1" x2="23" y2="23" /></svg>',
+    '<svg\n  xmlns="http://www.w3.org/2000/svg"\n  width="24"\n  height="24"\n  viewBox="0 0 24 24"\n>\n  <line x1="23" y1="1" x2="1" y2="23" />\n  <line x1="1" y1="1" x2="23" y2="23" />\n</svg>',
   'icon2.svg':
-    '<svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><circle cx="12" cy="12" r="11" /></svg>',
+    '<svg\n  xmlns="http://www.w3.org/2000/svg"\n  width="24"\n  height="24"\n  viewBox="0 0 24 24"\n>\n  <circle cx="12" cy="12" r="11" />\n</svg>',
 };
 
 function getSvg(svgFile) {

bin/build-icons-object.js

@@ -1,6 +1,7 @@
 /* eslint-disable import/no-extraneous-dependencies */
 import path from 'path';
 import cheerio from 'cheerio';
+import { minify } from 'html-minifier';
 
 /**
  * Build an object in the format: `{ <name>: <contents> }`.
@@ -28,7 +29,7 @@ function buildIconsObject(svgFiles, getSvg) {
  */
 function getSvgContents(svg) {
   const $ = cheerio.load(svg);
-  return $('svg').html();
+  return minify($('svg').html(), { collapseWhitespace: true });
 }
 
 export default buildIconsObject;

package.json

@@ -31,6 +31,7 @@
     "eslint": "^4.0.0",
     "eslint-config-airbnb-base": "^11.2.0",
     "eslint-plugin-import": "^2.5.0",
+    "html-minifier": "^3.5.6",
     "husky": "^0.13.4",
     "jest": "^21.2.1",
     "npm-run-all": "^4.1.2",