Let Yarn handle package.json formatting, not lint-staged

[josephfrazier]

When installing/removing packages, Yarn formats package.json, which
causes it to show up in the git diff as shown here:

git diff

diff --git a/package.json b/package.json
index 8efeb43..7db2342 100644
--- a/package.json
+++ b/package.json
@@ -6,7 +6,12 @@
     "node": ">=6.13.1",
     "npm": ">=3.10.10"
   },
-  "browserslist": [">1%", "last 4 versions", "Firefox ESR", "not ie < 9"],
+  "browserslist": [
+    ">1%",
+    "last 4 versions",
+    "Firefox ESR",
+    "not ie < 9"
+  ],
   "dependencies": {
     "@babel/polyfill": "^7.0.0-beta.44",
     "bluebird": "^3.5.1",
@@ -116,9 +121,18 @@
     "webpack-node-externals": "^1.7.2"
   },
   "lint-staged": {
-    "*.{js,jsx}": ["eslint --no-ignore --fix", "git add --force"],
-    "*.{json,md,graphql}": ["prettier --write", "git add --force"],
-    "*.{css,less,styl,scss,sass,sss}": ["stylelint --fix", "git add --force"]
+    "*.{js,jsx}": [
+      "eslint --no-ignore --fix",
+      "git add --force"
+    ],
+    "*.{json,md,graphql}": [
+      "prettier --write",
+      "git add --force"
+    ],
+    "*.{css,less,styl,scss,sass,sss}": [
+      "stylelint --fix",
+      "git add --force"
+    ]
   },
   "scripts": {
     "precommit": "lint-staged",

This change simply makes lint-staged ignore package.json, so that it
doesn't conflict with Yarn's formatting. See https://github.com/okonet/lint-staged/tree/1601c026abb283fc71791cf91980485d1ca8d085#advanced-config-format

[frenzzy]

Nice! Thank you

[josephfrazier]

Thanks for the quick merge!