Update dependency prettier to v1.13.4

Author: renovate-bot

package.json

@@ -62,7 +62,7 @@
     "lint-staged": "7.0.4",
     "nodemon": "1.17.3",
     "opentracing": "0.14.1",
-    "prettier": "1.12.0",
+    "prettier": "1.13.4",
     "zipkin": "0.10.1",
     "zipkin-transport-http": "0.10.1"
   },

yarn.lock

@@ -3744,9 +3744,9 @@ preserve@^0.2.0:
   version "0.2.0"
   resolved "https://registry.yarnpkg.com/preserve/-/preserve-0.2.0.tgz#815ed1f6ebc65926f865b310c0713bcb3315ce4b"
 
-prettier@1.12.0:
-  version "1.12.0"
-  resolved "https://registry.yarnpkg.com/prettier/-/prettier-1.12.0.tgz#d26fc5894b9230de97629b39cae225b503724ce8"
+prettier@1.13.4:
+  version "1.13.4"
+  resolved "https://registry.yarnpkg.com/prettier/-/prettier-1.13.4.tgz#31bbae6990f13b1093187c731766a14036fa72e6"
 
 pretty-format@^22.4.0:
   version "22.4.0"