Change public methods to private

Author: KowolTSH

src/Fogger/Data/Writer/ChunkWriterProvider.php

@@ -15,7 +15,7 @@ public function __construct(iterable $writers)
         }
     }
 
-    public function addWriter(ChunkWriterInterface $chunkWriter)
+    private function addWriter(ChunkWriterInterface $chunkWriter)
     {
         $this->chunkWriters[] = $chunkWriter;
     }

src/Fogger/Mask/MaskStrategyProvider.php

@@ -16,7 +16,7 @@ public function __construct(iterable $masks)
         }
     }
 
-    public function addMask(MaskStrategyInterface $mask)
+    private function addMask(MaskStrategyInterface $mask)
     {
         $this->masks[] = $mask;
     }

src/Fogger/Subset/SubsetStrategyProvider.php

@@ -15,7 +15,7 @@ public function __construct(iterable $subsetStrategies)
         }
     }
 
-    public function addSubsetStrategy(SubsetStrategyInterface $subsetStrategy)
+    private function addSubsetStrategy(SubsetStrategyInterface $subsetStrategy)
     {
         $this->subsetStrategies[] = $subsetStrategy;
     }