Update Vertex.swift

Author: richard-ash

Graph/Graph/Vertex.swift

@@ -24,16 +24,10 @@ extension Vertex: CustomStringConvertible {
 
 extension Vertex: Hashable {
 
-
-
-    
-    public func hasher(into hasher: inout Hasher){
-        
-        hasher.combine(data)
-        hasher.combine(index)
-    }
-
-
+  public func hasher(into hasher: inout Hasher) {
+    hasher.combine(data)
+    hasher.combine(index)
+  }
 
 }