Fixed initializer with hnsw

Sources/SwiftNLP/2. Encoding/ContextFreeEncoder.swift

@@ -69,7 +69,7 @@ class ContextFreeEncoder<Scalar: BinaryFloatingPoint & Codable>: SNLPEncoder {
             return
         }
         dictionary = ContextFreeEncoder<Scalar>.readDictionaryFromFile(url)
-        
+        hnsw = ContextFreeEncoder<Scalar>.readHNSWFromFile(url)
     }
     
     subscript(_ token: String) -> [Scalar] {