Expose init for filter

Sources/Filter.swift

@@ -56,6 +56,10 @@ public struct Filter {
     
     let transform: Transformer
 
+    public init(tranform: Transformer) {
+        self.transform = tranform
+    }
+    
     /// Tint filter which will apply a tint color to images.
     public static var tint: (Color) -> Filter = {
         color in

Sources/ImageSerializer.swift

@@ -27,7 +27,7 @@
 import Foundation
 
 /// An `CacheSerializer` would be used to convert some data to an image object for 
-/// retrieving from disk cache or vice versa for storing to disk cache.
+/// retrieving from disk cache and vice versa for storing to disk cache.
 public protocol CacheSerializer {
     
     /// Get the serialized data from a provided image