style: update prettier

Author: SimenB

lib/writer.js

@@ -49,21 +49,15 @@ module.exports = class Writer extends EventEmitter {
         for (const file of this.files) {
             assert(
                 typeof file === 'string',
-                `Expected 'file' (${
-                    file
-                }) to be of type 'string', instead got '${typeof file}'`
+                `Expected 'file' (${file}) to be of type 'string', instead got '${typeof file}'`
             );
             assert(
                 isAbsolute(file),
-                `Expected 'file' (${
-                    file
-                }) to be an absolute path to a file but it was not`
+                `Expected 'file' (${file}) to be an absolute path to a file but it was not`
             );
             assert(
                 existsSync(file),
-                `Expected 'file' (${
-                    file
-                }) to exist on file system but it did not`
+                `Expected 'file' (${file}) to exist on file system but it did not`
             );
         }
     }

package-lock.json

@@ -40,7 +40,7 @@
     "husky": "^0.14.3",
     "jest": "^22.0.4",
     "lint-staged": "^6.0.0",
-    "prettier": "^1.8.2",
+    "prettier": "^1.9.2",
     "projectz": "^1.4.0",
     "semantic-release": "^8.2.3"
   },