Update dependency prettier to v2

Author: renovate-bot

package.json

@@ -25,7 +25,7 @@
     "dev-null-stream": "0.0.1",
     "jest": "24.9.0",
     "markdown-toc": "1.2.0",
-    "prettier": "1.18.2"
+    "prettier": "2.1.2"
   },
   "scripts": {
     "toc": "yarn run markdown-toc -i doc/recipes.md",

yarn.lock

@@ -2956,9 +2956,10 @@ prelude-ls@~1.1.2:
   version "1.1.2"
   resolved "https://registry.yarnpkg.com/prelude-ls/-/prelude-ls-1.1.2.tgz#21932a549f5e52ffd9a827f570e04be62a97da54"
 
-[email protected]:
-  version "1.18.2"
-  resolved "https://registry.yarnpkg.com/prettier/-/prettier-1.18.2.tgz#6823e7c5900017b4bd3acf46fe9ac4b4d7bda9ea"
+[email protected]:
+  version "2.1.2"
+  resolved "https://registry.yarnpkg.com/prettier/-/prettier-2.1.2.tgz#3050700dae2e4c8b67c4c3f666cdb8af405e1ce5"
+  integrity sha512-16c7K+x4qVlJg9rEbXl7HEGmQyZlG4R9AgP+oHKRMsMsuk8s+ATStlf1NpDqyBI1HpVyfjLOeMhH2LvuNvV5Vg==
 
 pretty-format@^24.9.0:
   version "24.9.0"