Typescript is not updated for RNFetchBlobWriteStream's write() method

[andresmejia3]

Version: 0.12.0

In the documentation it says "Since version 0.10.9 write() resolves with the RNFetchBlob instance so you can promise-chain write calls", but in the typescript index it shows that write resolves with a void promise.

export interface RNFetchBlobWriteStream {
    id: string;
    encoding: string;
    append: boolean;

    write(data: string): Promise<void>;
    close(): void;
}

The library still works, but it trips up intellisense. Are you open to accepting pull requests? Thanks again for the great library!