Change target to ES2018

Author: srmagura

CHANGELOG.md

@@ -13,7 +13,7 @@
         portal. The new `SkeletonTheme` does work in this case.
 -   `SkeletonTheme`: rename the `color` prop to `baseColor`
 -   Convert to TypeScript
--   Publish code as ES2015
+-   Publish code as ES2018 to reduce bundle size
 -   Require React >= 16.8.0
 -   Drop Internet Explorer support
 

tsconfig.json

@@ -1,7 +1,7 @@
 {
     "compilerOptions": {
         /* Language and Environment */
-        "target": "ES2015",
+        "target": "ES2018",
         "jsx": "react",
 
         /* Modules */