Update lint-staged config to run prettier on more file types.

Also fix Prettier issues

Author: thebuilder

README.md

@@ -58,7 +58,7 @@ The **`<Observer />`** accepts the following props:
 | **root**        | HTMLElement             |         | false    | The HTMLElement that is used as the viewport for checking visibility of the target. Defaults to the browser viewport if not specified or if null.                                                                                |
 | **rootId**      | String                  |         | false    | Unique identifier for the root element - This is used to identify the IntersectionObserver instance, so it can be reused. If you defined a root element, without adding an id, it will create a new instance for all components. |
 | **rootMargin**  | String                  | '0px'   | false    | Margin around the root. Can have values similar to the CSS margin property, e.g. "10px 20px 30px 40px" (top, right, bottom, left).                                                                                               |
-| **tag**         | String                  | 'div'   | false    | Element tag to use for the wrapping element when rendering using 'children'. Defaults to 'div'                                                                                                                                                                              |
+| **tag**         | String                  | 'div'   | false    | Element tag to use for the wrapping element when rendering using 'children'. Defaults to 'div'                                                                                                                                   |
 | **threshold**   | Number                  | 0       | false    | Number between 0 and 1 indicating the the percentage that should be visible before triggering. Can also be an array of numbers, to create multiple trigger points.                                                               |
 | **triggerOnce** | Bool                    | false   | false    | Only trigger this method once                                                                                                                                                                                                    |
 | **onChange**    | Func                    |         | false    | Call this function whenever the in view state changes                                                                                                                                                                            |
@@ -121,7 +121,6 @@ const Component = () => (
 export default Component
 ```
 
-
 ### Polyfill for intersection-observer
 
 The component requires the [intersection-observer
@@ -172,4 +171,4 @@ function supportsIntersectionObserver() {
     'intersectionRatio' in IntersectionObserverEntry.prototype
   )
 }
-```
+```

index.d.ts

@@ -66,4 +66,4 @@ declare module 'react-intersection-observer' {
   > {}
 }
 
-export default Component
+export default Component

package.json

@@ -25,17 +25,21 @@
     "dev": "concurrently -k -r 'jest --watch' 'npm run storybook'",
     "lint": "eslint {src,stories,tests}/. ",
     "precommit": "flow && lint-staged",
-    "postcommit": "git reset",
+    "postcommit": "git update-index --again",
     "prepare": "npm run build",
     "pretty": "prettier '**/*.{js,md,json}' --write",
     "storybook": "start-storybook -p 9000",
     "test": "eslint {src,stories,tests}/. && jest"
   },
   "lint-staged": {
-    "*.js": [
-      "prettier --write --no-semi --single-quote --trailing-comma all",
-      "eslint",
+    "*.{js,json,css,md,ts}": [
+      "prettier --write",
       "git add"
+    ],
+    "src/**/*.js": [
+      "eslint",
+      "jest --findRelatedTests",
+      "flow force-recheck --focus"
     ]
   },
   "eslintConfig": {