Add default bio value, to fix GitHub integration errors (#68)

* Change header name

* Add default bio value

* Remove default

src/auth/mod.rs

@@ -25,7 +25,7 @@ pub struct GitHubUser {
     pub avatar_url: String,
     pub name: String,
     pub email: Option<String>,
-    pub bio: String,
+    pub bio: Option<String>,
 }
 
 pub async fn get_github_user_from_token(