fix headings [skip ci]

experimental/babel-preset-env/README.md

@@ -20,8 +20,8 @@
 - [How it Works](#how-it-works)
 - [Install](#install)
 - [Usage](#usage)
-  - [Options](#options)
-  - [Examples](#examples)
+- [Options](#options)
+- [Examples](#examples)
 - [Caveats](#caveats)
   
 ## How it Works
@@ -72,9 +72,9 @@ The default behavior without options runs all transforms (acts as [babel-preset-
 }
 ```
 
-### [Options](http://babeljs.io/docs/plugins/#pluginpresets-options)
+## [Options](http://babeljs.io/docs/plugins/#pluginpresets-options)
 
-#### `targets`: `{ [string]: number }`
+### `targets`: `{ [string]: number }`
 
 Defaults to `{}`.
 
@@ -85,33 +85,33 @@ Example environments: "chrome, edge, firefox, safari, ie, ios, node".
 
 The data for this is currently at: [/data/plugins.json](/data/plugins.json) and being generated by [/scripts/build-data.js](/scripts/build-data.js) using https://kangax.github.io/compat-table.
 
-##### `node`: `number | "current" | true`
+`node`: `number | "current" | true`
 
 If you want to compile against the current node version, you can specify `"node": true` or `"node": "current"` which would be the same as `node": parseFloat(process.versions.node)`
 
-#### `browsers`: `Array<string> | string`
+### `browsers`: `Array<string> | string`
 
 > A query to select browsers (ex: last 2 versions, > 5%) using [browserslist](https://github.com/ai/browserslist).  
 
 > Note, browsers' results are overridden by explicit items from `targets`.
 
-#### `loose`: `boolean`
+### `loose`: `boolean`
 
 Defaults to `false`.
 Enable "loose" transformations for any plugins in this preset that allow them.
 
-#### `modules`: `"amd" | "umd" | "systemjs" | "commonjs" | false`
+### `modules`: `"amd" | "umd" | "systemjs" | "commonjs" | false`
 
 Defaults to `"commonjs"`.
 Enable transformation of ES6 module syntax to another module type.
 Can be `false` to not transform modules.
 
-#### `debug:` `boolean`
+### `debug:` `boolean`
 
 Defaults to `false`
 `console.log` out the targets and plugins being used as well as the version specified in `/data/plugins.json`.
 
-#### `whitelist`: `Array<string>`
+### `whitelist`: `Array<string>`
 
 Defaults to `[]`
 Enable a whitelist of plugins to always include.
@@ -120,7 +120,7 @@ Useful if there is a bug in a native implementation, or a combination of a non-s
 
 Ex: Node 4 supports native classes but not spread.
 
-### Examples
+## Examples
 
 ```js
 // src
@@ -184,7 +184,7 @@ export var A = function A() {
 };
 ```
 
-#### Example with `node: true` or `node: "current"`
+### Example with `node: true` or `node: "current"`
 
 ```js
 // process.versions.node -> 6.9.0