Merge pull request #112 from milesmatthias/patch-2

Fix installation via github instructions

README.md

 
 ```sh
 # replace <branch_name> with any one of the branches
-npm install --save github:joltup/rn-fetch-blob-package#<branch_name>
+npm install --save github:joltup/rn-fetch-blob#<branch_name>
 ```
 
 **Manually Link Native Modules**