Merge pull request #1685 from Shopify/new-line-svg

[SVG] adding new line to optimize script

Author: dleroux

CHANGELOG.md

@@ -21,6 +21,7 @@ Use Option list to present a group of selectable items outside of the context of
 - Added `prefix` and `suffix` props to `RangeSlider` for better layout control ([#1584](https://github.com/Shopify/polaris-react/pull/1584))
 - Added testing documentation and examples in AppProvider ([#1556](https://github.com/Shopify/polaris-react/pull/1556))
 - Performance: optimized avatar SVG files ([#1662](https://github.com/Shopify/polaris-react/pull/1662))
+- Updated yarn optimize to add new line at the end of SVG files ([#1685](https://github.com/Shopify/polaris-react/pull/1685))
 
 ### Bug fixes
 

scripts/optimize.js

@@ -26,7 +26,7 @@ function optimizeFile(file) {
       removeSync(file);
 
       const newFile = resolvePath(dirname(file), `${paramCase(basename(file, '.svg'))}.svg`);
-      writeFileSync(newFile, result.data);
+      writeFileSync(newFile, `${result.data}\n`);
       resolve();
     });
   });