Moves prettier to dev dependency

package.json

@@ -61,7 +61,6 @@
     "mousetrap": "^1.4.6",
     "name-all-modules-plugin": "^1.0.1",
     "pikaday": "^1.6.1",
-    "prettier": "^1.9.2",
     "prismjs": "^1.6.0",
     "raphael": "^2.2.7",
     "raven-js": "^3.14.0",
@@ -109,6 +108,7 @@
     "karma-sourcemap-loader": "^0.3.7",
     "karma-webpack": "^2.0.4",
     "nodemon": "^1.11.0",
+    "prettier": "1.9.2",
     "webpack-dev-server": "^2.6.1"
   }
 }

yarn.lock

@@ -5146,14 +5146,14 @@ preserve@^0.2.0:
   version "0.2.0"
   resolved "https://registry.yarnpkg.com/preserve/-/preserve-0.2.0.tgz#815ed1f6ebc65926f865b310c0713bcb3315ce4b"
 
+prettier@1.9.2:
+  version "1.9.2"
+  resolved "https://registry.yarnpkg.com/prettier/-/prettier-1.9.2.tgz#96bc2132f7a32338e6078aeb29727178c6335827"
+
 prettier@^1.7.0:
   version "1.8.2"
   resolved "https://registry.yarnpkg.com/prettier/-/prettier-1.8.2.tgz#bff83e7fd573933c607875e5ba3abbdffb96aeb8"
 
-prettier@^1.9.2:
-  version "1.9.2"
-  resolved "https://registry.yarnpkg.com/prettier/-/prettier-1.9.2.tgz#96bc2132f7a32338e6078aeb29727178c6335827"
-
 prismjs@^1.6.0:
   version "1.6.0"
   resolved "https://registry.yarnpkg.com/prismjs/-/prismjs-1.6.0.tgz#118d95fb7a66dba2272e343b345f5236659db365"