Deprecate parameter element (#176)

* Mark the parameter element as deprecated

* Remove the test of the deprecated element

Author: mattesmohr

Sources/HTMLKit/Abstraction/Elements/ObjectElements.swift

@@ -29,8 +29,10 @@ public struct Parameter: EmptyNode, ObjectElement {
 
     internal var attributes: OrderedDictionary<String, Any>?
 
+    @available(*, deprecated, message: "The parameter element is no longer part of the web standards. Use the data attribute of the object element instead.")
     public init() {}
 
+    @available(*, deprecated, message: "The parameter element is no longer part of the web standards. Use the data attribute of the object element instead.")
     internal init(attributes: OrderedDictionary<String, Any>?) {
         self.attributes = attributes
     }

Tests/HTMLKitTests/ElementTests.swift

@@ -1072,21 +1072,6 @@ final class ElementTests: XCTestCase {
         )
     }
 
-    func testParameterElement() throws {
-        
-        let view = TestView {
-            Parameter()
-            Param()
-        }
-        
-        XCTAssertEqual(try renderer.render(view: view),
-                       """
-                       <param>\
-                       <param>
-                       """
-        )
-    }
-    
     func testVideoElement() throws {
 
         let view = TestView {