addRole and removeRole permission checks

Author: valzargaming

src/Discord/Parts/User/Member.php

@@ -303,6 +303,11 @@ public function addRole($role, ?string $reason = null): PromiseInterface
                     return reject(new NoPermissionsException("You do not have permission to add member role in the guild {$guild->id}."));
                 }
             }
+            if ($botHighestRole = $guild->roles->getCurrentMemberHighestRole()) {
+                if ($botHighestRole->comparePosition($this) <= 0) {
+                    return reject(new NoPermissionsException("The bot's highest role is not higher than the role {$this->id} in guild {$this->guild_id}."));
+                }
+            }
         }
 
         $headers = [];
@@ -342,6 +347,11 @@ public function removeRole($role, ?string $reason = null): PromiseInterface
                     return reject(new NoPermissionsException("You do not have permission to remove member role in the guild {$guild->id}."));
                 }
             }
+            if ($botHighestRole = $guild->roles->getCurrentMemberHighestRole()) {
+                if ($botHighestRole->comparePosition($this) <= 0) {
+                    return reject(new NoPermissionsException("The bot's highest role is not higher than the role {$this->id} in guild {$this->guild_id}."));
+                }
+            }
         }
 
         $headers = [];