Update dependency prettier to v1.15.1

Author: renovate-bot

package.json

@@ -44,6 +44,6 @@
     "husky": "^1.0.0-rc.13",
     "jest": "^23.5.0",
     "lint-staged": "^7.2.0",
-    "prettier": "1.14.3"
+    "prettier": "1.15.1"
   }
 }

yarn.lock

@@ -2744,9 +2744,9 @@ preserve@^0.2.0:
   version "0.2.0"
   resolved "https://registry.yarnpkg.com/preserve/-/preserve-0.2.0.tgz#815ed1f6ebc65926f865b310c0713bcb3315ce4b"
 
-prettier@1.14.3:
-  version "1.14.3"
-  resolved "https://registry.yarnpkg.com/prettier/-/prettier-1.14.3.tgz#90238dd4c0684b7edce5f83b0fb7328e48bd0895"
+prettier@1.15.1:
+  version "1.15.1"
+  resolved "https://registry.yarnpkg.com/prettier/-/prettier-1.15.1.tgz#06c67106afb1b40e74b002353b2079cc7e0e67bf"
 
 pretty-format@^23.2.0:
   version "23.2.0"