Add KeyRingInfo.getVersion()

pgpainless-core/src/main/java/org/pgpainless/key/info/KeyRingInfo.java

@@ -727,6 +727,15 @@ public class KeyRingInfo {
         return false;
     }
 
+    /**
+     * Return the version number of the public keys format.
+     *
+     * @return version
+     */
+    public int getVersion() {
+        return keys.getPublicKey().getVersion();
+    }
+
     /**
      * Return a list of all subkeys which can be used for encryption of the given purpose.
      * This list does not include expired or revoked keys.

pgpainless-core/src/test/java/org/pgpainless/key/info/KeyRingInfoTest.java

@@ -75,6 +75,8 @@ public class KeyRingInfoTest {
         assertEquals(Collections.singletonList("<emil@email.user>"), pInfo.getUserIds());
         assertEquals(Collections.singletonList("emil@email.user"), sInfo.getEmailAddresses());
         assertEquals(Collections.singletonList("emil@email.user"), pInfo.getEmailAddresses());
+        assertEquals(4, sInfo.getVersion());
+        assertEquals(4, pInfo.getVersion());
 
         assertTrue(sInfo.isSecretKey());
         assertFalse(pInfo.isSecretKey());