Fix Twitter, Together! README link
We use devel as our main branch, fix Twitter, Together! README link
accordingly. Also use a normal URL instead of path for clarity.
To create a new tweet create a new `*.tweet` file in this `tweets/` folder.
-<kbd>[Create new tweet](../../../new/master/?filename=tweets/<your-path>.tweet)</kbd>
+<kbd>[Create new tweet](https://github.com/submariner-io/submariner/new/devel/?filename=tweets/%3Cyour-path%3E.tweet)</kbd>
## Example
