Badges: Add responsible disclosure badge.

Fix: Don't serialize None on Metadata. (january embed)

src/database/entities/microservice/january.rs

@@ -63,7 +63,9 @@ pub enum Special {
 
 #[derive(Serialize, Deserialize, Debug, Clone)]
 pub struct Metadata {
+    #[serde(skip_serializing_if = "Option::is_none")]
     url: Option<String>,
+    #[serde(skip_serializing_if = "Option::is_none")]
     special: Option<Special>,
 
     #[serde(skip_serializing_if = "Option::is_none")]

src/database/entities/user.rs

@@ -66,6 +66,7 @@ pub enum Badges {
     Developer = 1,
     Translator = 2,
     Supporter = 4,
+    ResponsibleDisclosure = 8,
     EarlyAdopter = 256,
 }