Fix base-url not overriding processed images urls

Closes #418

CHANGELOG.md

@@ -9,6 +9,7 @@
 - Link checker will not try to validate email links anymore
 - Load table and footnote markdown extensions in `markdown` filter
 - `get_url` now defaults to not adding a trailing slash
+- Fix `--base-url` not overriding processed images URLs
 
 ## 0.4.2 (2018-09-03)
 

src/cmd/build.rs

@@ -9,7 +9,7 @@ pub fn build(config_file: &str, base_url: Option<&str>, output_dir: &str) -> Res
     let mut site = Site::new(env::current_dir().unwrap(), config_file)?;
     site.set_output_path(output_dir);
     if let Some(b) = base_url {
-        site.config.base_url = b.to_string();
+        site.set_base_url(b.to_string());
     }
     site.load()?;
     console::notify_site_size(&site);