add heic

src/Intervention/Image/AbstractEncoder.php

@@ -190,6 +190,11 @@ abstract class AbstractEncoder
                 $this->result = $this->processAvif();
                 break;
 
+            case 'heic':
+            case 'image/heic':
+                $this->result = $this->processHeic();
+                break;
+                
             default:
                 throw new NotSupportedException(
                     "Encoding format ({$this->format}) is not supported."