Resolve "Add Revocation document structure, building and parsing"

Closes #48 (closed)

documents/blockchain/v10/documents/certification.rs

@@ -173,7 +173,7 @@ impl<'a> TextDocumentBuilder for CertificationDocumentBuilder<'a> {
     fn generate_text(&self) -> String {
         format!(
             "Version: 10
-Type: Membership
+Type: Certification
 Currency: {currency}
 Issuer: {issuer}
 IdtyIssuer: {target}
@@ -259,7 +259,7 @@ mod tests {
         ).unwrap();
 
         let sig = ed25519::Signature::from_base64(
-            "xNhaCa+HgrQh/2koZ3a7PGku8h+NXIp7YxFcLYzS/YLwNA4lNXOks8hAIX4QyPy7hTUWPlhcQNdq74exXm5pCw==",
+            "qfR6zqT1oJbqIsppOi64gC9yTtxb6g6XA9RYpulkq9ehMvqg2VYVigCbR0yVpqKFsnYiQTrnjgFuFRSJCJDfCw==",
         ).unwrap();
 
         let target = ed25519::PublicKey::from_base58(