Update README.md with tip on project references

Wanted to include a note for folks upgrading from the old branch to the new branch about renaming all product references as this was a problem I came across in #122 (https://github.com/joltup/rn-fetch-blob/issues/122)

Fixed trusty example calling `then` instead of `fetch`

Removed output directory check / create. Fixes all file types moving.

Added check for failing to create the output directory

Fixed truncating of progress report values.

Added null and path key check on addCompleteDownload method

Fixed file moving

Fix installation via github instructions

update README.md to inform the handle of cookies

Fix notification value for android download Manager

Reject promise by iOS openDocument when a file is not opened

No depracation warning on instantiating dirs

Bug fix: Support Android content URIs for upload

Bug Fix Branch 0.10.9 "...exposed beyond app through Intent.getData() " at Android N

fixes #64

Add manual linking instructions

There are a million issues around people having issues with automatically linking and having a link to manual instructions would address a lot of these up front. This also follows the instructions pattern of most react native modules.

Response typo

Bug Fix: getExternalFilesDir null check

compatible with RN > 0.49

Fix typo: "Status" instead of "Statu"

Update README with proper status code handling