Update README.md

README.md

 
 ## API
 
-#### `config(options:RNFetchBlobConfig):fetch`
-
 ---
 
+### `config(options:RNFetchBlobConfig):fetch`
+
 `0.5.0`
 
 Config API was introduced in `v0.5.0` which provides some options for the `fetch` task.
 
 see [RNFetchBlobConfig](#user-content-rnfetchblobconfig)
 
-#### `fetch(method, url, headers, body):Promise<FetchBlobResponse>`
-
 ---
 
+### `fetch(method, url, headers, body):Promise<FetchBlobResponse>`
+
 `legacy`
 
 Send a HTTP request uses given headers and body, and return a Promise.
 Body of the HTTP request, body can either be a BASE64 string, or an array contains object elements, each element have 2  required property `name`, and `data`, and 1 optional property `filename`, once `filename` is set, content in `data` property will be consider as BASE64 string that will be converted into byte array later.
 When body is a base64 string , this string will be converted into byte array in native code, and the request body will be sent as `application/octet-stream`.
 
-#### `fetch(...).progress(eventListener):Promise<FetchBlobResponse>`
-
 ---
 
+### `fetch(...).progress(eventListener):Promise<FetchBlobResponse>`
+
 `0.4.2`
 
 Register on progress event handler for a fetch request.
 
 TODO
 
-#### `base64`
-
 ---
 
+### `base64`
+
+
 `0.4.2`
 
 A helper object simply uses [base-64](https://github.com/mathiasbynens/base64) for decode and encode BASE64 data.
 RNFetchBlob.base64.decode(data)
 ```
 
-#### `fs`
-
 ---
 
+### `fs`
+
 `0.5.0`
 
 #### getSystemDirs():Promise
 
 #### createFile(path, data, encoding):Promise
 
-#### path:`string`
+##### path:`string`
 The path which this new file will be created.
-#### data:`string` | `Array<number>`
+##### data:`string` | `Array<number>`
 Content of the new file, when `encoding` is `ascii`, this argument shoud be an array contains number 0~255.
-#### encoding:`utf8` | `base64` | `ascii`
+##### encoding:`utf8` | `base64` | `ascii`
 Encoding of content.
 
 the following expressions are equivalent.
 
 #### writeStream(path:string, encoding:string, append:boolean):Promise<WriteStream>
 
-#### path:`string`
+##### path:`string`
 The path to the file the stream is writing to.
-#### encoding:`utf8` | `base64` | `ascii`
+##### encoding:`utf8` | `base64` | `ascii`
 Encoding of input data.
-#### append:`boolean`(optional, default to `false`)
+##### append:`boolean`(optional, default to `false`)
 Will new data append after existing file or not.
 
 Calling `writeStream` method will returns a Promise, which resolves a `RNFetchBlobWriteSteam` instance when stream opened successfully.
 
 #### readStream(path, encoding, bufferSize):Promise<ReadStream>
 
-#### path:`string`
+##### path:`string`
 The path to the file the stream is reading from.
-#### encoding:`string`
+##### encoding:`string`
 Encoding of the data.
-#### bufferSize:`number`(optional)
+##### bufferSize:`number`(optional)
 Buffer size of read stream, default to `4096` and `4095`(when encoding is `base64`)
 
 `readStream` returns a promise which will resolve `RNFetchBlobReadStream`.
 
 ### Types
 
+---
+
 #### RNFetchBlobConfig
 
+---
+
 A set of configurations that will be injected into a `fetch` method, with the following properties.
 
 #### fileCache:boolean
   - mediaScannable : A `boolean` value, see [Officail Document](https://developer.android.com/reference/android/app/DownloadManager.html#addCompletedDownload(java.lang.String, java.lang.String, boolean, java.lang.String, java.lang.String, long, boolean))
   - notification : A `boolean` value decide whether show a notification when download complete.
 
+---
 
 #### RNFetchBlobResponse
 
+---
+
 When `fetch` success, it resolve a `FetchBlobResponse` object as first argument. `FetchBlobResponse` object has the following methods (these method are synchronous, so you might take quite a performance impact if the file is big)
 
 #### base64():string
 resp.session('session-name')
 ```
 
+---
+
 #### RNFetchBlobSession
 
+---
+
 A `session` is an object that helps you manage files. It simply main a list of file path and let you use `dispose()`to delete files in this session once and for all.
 
 #### add(path:string):RNFetchBlobSession
 
 | Version | |
 |---|---|
-| ~0.3.0 | Upload/Download octet-stream and form-data |
-| 0.4.0 | Add base-64 encode/decode library and API |
-| 0.4.1 | Fixe upload form-data missing file extension problem on Android |
-| 0.4.2 | Supports upload/download progress |
 | 0.5.0 | Upload/download with direct access to file storage, and also added file access APIs |
+| 0.4.2 | Supports upload/download progress |
+| 0.4.1 | Fixe upload form-data missing file extension problem on Android |
+| 0.4.0 | Add base-64 encode/decode library and API |
+| ~0.3.0 | Upload/Download octet-stream and form-data |
 
 ### TODOs