Bump version

Cargo.toml

 [package]
 name = "pika-backup"
 description = "Simple backups based on borg"
-version = "0.1.0-rc.1"
+version = "0.1.0-rc.2"
 authors = ["Sophie Herold <sophie@hemio.de>"]
 homepage = "https://gitlab.gnome.org/sophie-h/pika-backup"
 edition = "2018"
@@ -45,4 +45,3 @@ glib = "0.10"
 gtk = { version = "0.9", features = ["v3_24"] }
 pango = "0.9"
 
-[dev-dependencies]