fix: Package::new() features

Signed-off-by: Adam Perkowski <[email protected]>

src/config.rs

@@ -72,14 +72,17 @@ impl Package {
         let mut package = Package::default();
 
         match source.as_ref() {
+            #[cfg(feature = "aur")]
             "aur" => {
                 package.aur = target;
                 Ok(())
             }
+            #[cfg(feature = "github")]
             "github" => {
                 package.github = target;
                 Ok(())
             }
+            #[cfg(feature = "gitlab")]
             "gitlab" => {
                 package.gitlab = target;
                 Ok(())