Remove 1.7 support

src/main/java/fr/xephi/authme/permission/handlers/LuckPermsHandler.java

@@ -197,13 +197,4 @@ public class LuckPermsHandler implements PermissionHandler {
         }
     }
 
-    @Override
-    public void loadUserData(String name) throws PermissionLoadUserException {
-        try {
-            UUID uuid = luckPermsApi.getUserManager().lookupUuid(name).get(5, TimeUnit.SECONDS);
-            loadUserData(uuid);
-        } catch (InterruptedException | ExecutionException | TimeoutException e) {
-            throw new PermissionLoadUserException("Unable to load the permission data of the user " + name, e);
-        }
-    }
 }

src/main/java/fr/xephi/authme/permission/handlers/PermissionHandler.java

@@ -110,6 +110,4 @@ public interface PermissionHandler {
     default void loadUserData(UUID uuid) throws PermissionLoadUserException {
     }
 
-    default void loadUserData(String name) throws PermissionLoadUserException {
-    }
 }