Use newly merged inheritance spec tests

Sources/HummingbirdMustache/CustomRenderable.swift

@@ -11,6 +11,7 @@
 // SPDX-License-Identifier: Apache-2.0
 //
 //===----------------------------------------------------------------------===//
+
 import Foundation
 
 protocol HBMustacheCustomRenderable {

Sources/HummingbirdMustache/Lambda.swift

@@ -12,7 +12,6 @@
 //
 //===----------------------------------------------------------------------===//
 
-
 /// Lambda function. Can add this to object being rendered to filter contents of objects.
 ///
 /// See http://mustache.github.io/mustache.5.html for more details on

Sources/HummingbirdMustache/Template+Render.swift

@@ -11,6 +11,7 @@
 // SPDX-License-Identifier: Apache-2.0
 //
 //===----------------------------------------------------------------------===//
+
 import Foundation
 
 extension HBMustacheTemplate {

Tests/HummingbirdMustacheTests/SpecTests.swift

@@ -136,9 +136,6 @@ final class MustacheSpecTests: XCTestCase {
     }
 
     func testInheritanceSpec() throws {
-        let url = URL(
-            string: "https://raw.githubusercontent.com/mustache/spec/ab227509e64961943ca374c09c08b63f59da014a/specs/inheritance.json"
-        )!
-        try self.testSpec(url: url)
+        try self.testSpec(name: "~inheritance")
     }
 }