Adding hinge loss to allTests (tensorflow#186)

Author: Shashi456

Tests/TensorFlowTests/LossTests.swift

@@ -160,6 +160,7 @@ final class LossTests: XCTestCase {
     static var allTests = [
         ("testMeanSquaredErrorLoss", testMeanSquaredErrorLoss),
         ("testMeanSquaredErrorGrad", testMeanSquaredErrorGrad),
+        ("testHingeLoss", testHingeLoss),
         ("testSoftmaxCrossEntropyWithProbabilitiesLoss",
          testSoftmaxCrossEntropyWithProbabilitiesLoss),
         ("testSoftmaxCrossEntropyWithProbabilitiesGrad",