#10 Set encryption algorithm

| Q | A | --- | --- | Add a plugin? | No | If yes, URL of the plugin | | Modify the configuration (if yes, describe bellow)? | Yes | Bug fix? | No **Add a small description of your PR here:** Set the encrytion algoithm to `blowfish2` ([the best currently implemented on Vim](https://vim.fandom.com/wiki/Encryption)) for the `:X` command.