Add methods for Array and Dictionary

Sources/HummingbirdMustache/Method.swift

@@ -22,6 +22,32 @@ extension String: HBMustacheBaseMethods {
         switch name {
         case "lowercased":
             return self.lowercased()
+        case "uppercased":
+            return self.uppercased()
+        default:
+            return nil
+        }
+    }
+}
+
+extension Array: HBMustacheBaseMethods {
+    func runMethod(_ name: String) -> Any? {
+        switch name {
+        case "reversed":
+            return self.reversed()
+        case "enumerated":
+            return self.enumerated()
+        default:
+            return nil
+        }
+    }
+}
+
+extension Dictionary: HBMustacheBaseMethods {
+    func runMethod(_ name: String) -> Any? {
+        switch name {
+        case "enumerated":
+            return self.enumerated()
         default:
             return nil
         }