Added enhance presets

Author: Bartek Kwiecien

filestack/mixins/imagetransformation.py

@@ -94,7 +94,7 @@ def collage(self, files=None, margin=None, width=None, height=None, color=None,
     def upscale(self, upscale=None, noise=None, style=None):
         return self._add_transform_task('upscale', locals())
 
-    def enhance(self):
+    def enhance(self, preset=None):
         return self._add_transform_task('enhance', locals())
 
     def redeye(self):