Fixed the issue with Dropbox Upload which was happening because the t…

…oken expires, added the refreh token logic

README.md

@@ -227,7 +227,7 @@ Feel free to open issues or submit pull requests if you have any improvements or
 
 ### Issues:
 
-- ~~ The dropbox isn't working at the moment because the token expiration, I need to find out a way to tackle that here, the main code `reddit_stash.py` works as expected.
+- ~~The dropbox isn't working at the moment because the token expiration, I need to find out a way to tackle that here, the main code `reddit_stash.py` works as expected.~~
 - The dropbox code needs to have the hashing mechanism, to make the upload faster.
 - The `reddit_stash.py` downloads all the file first and decides if the file is availble or not, implement early exit startegy while relevent fetching the content.
 - The file size calculation should be done once rather than in each iterations.