style(cli): remove extra newline from version output

[tessus]

Due to orhun/rustypaste#97 the -V argument now prints an extra newline.

This PR removes the extra newline character.

Before

[tessus@epsilon3 0 ~/data/tmp/rptest]$ rpaste -s https://rptest.local/paste -V -a token
rustypaste-server 0.11.1

[tessus@epsilon3 0 ~/data/tmp/rptest]$

After

This is how it looked before orhun/rustypaste#97

[tessus@epsilon3 0 ~/data/tmp/rptest]$ rpaste -s https://rptest.local/paste -V -a token
rustypaste-server 0.11.1
[tessus@epsilon3 0 ~/data/tmp/rptest]$