Update dependency prettier to v1.15.3

Author: renovate-bot

package.json

@@ -52,7 +52,7 @@
     "gh-pages": "1.2.0",
     "light-ts-loader": "1.1.2",
     "npm-run-all": "4.1.3",
-    "prettier": "1.13.7",
+    "prettier": "1.15.3",
     "react": "16.7.0",
     "react-dom": "16.7.0",
     "rollup": "0.60.7",

yarn.lock

@@ -6483,9 +6483,9 @@ preserve@^0.2.0:
   version "0.2.0"
   resolved "https://registry.yarnpkg.com/preserve/-/preserve-0.2.0.tgz#815ed1f6ebc65926f865b310c0713bcb3315ce4b"
 
-prettier@1.13.7:
-  version "1.13.7"
-  resolved "https://registry.yarnpkg.com/prettier/-/prettier-1.13.7.tgz#850f3b8af784a49a6ea2d2eaa7ed1428a34b7281"
+prettier@1.15.3:
+  version "1.15.3"
+  resolved "https://registry.yarnpkg.com/prettier/-/prettier-1.15.3.tgz#1feaac5bdd181237b54dbe65d874e02a1472786a"
 
 prettier@^1.11.1:
   version "1.13.5"