Fix failed line missing from TAP output

lib/reporters/tap.js

@@ -7,7 +7,7 @@ function getSourceFromStack(stack, index) {
 		.split('\n')
 		.slice(index, index + 1)
 		.join('')
-		.replace(/^\s+at /, '');
+		.replace(/^\s+ /, '');
 }
 
 function TapReporter() {
@@ -35,7 +35,7 @@ TapReporter.prototype.test = function (test) {
 			'    operator: ' + test.error.operator,
 			'    expected: ' + test.error.expected,
 			'    actual: ' + test.error.actual,
-			'    at: ' + getSourceFromStack(test.error.stack, 3),
+			'    at: ' + getSourceFromStack(test.error.stack, 1),
 			'  ...'
 		];
 	} else {

test/reporters/tap.js

@@ -35,7 +35,7 @@ test('failing test', function (t) {
 			operator: '==',
 			expected: true,
 			actual: false,
-			stack: ['', '', '', ' at Test.fn (test.js:1:2)'].join('\n')
+			stack: ['', 'Test.fn (test.js:1:2)'].join('\n')
 		}
 	});
 
@@ -60,7 +60,7 @@ test('unhandled error', function (t) {
 	var actualOutput = reporter.unhandledError({
 		message: 'unhandled',
 		name: 'TypeError',
-		stack: ['', ' at Test.fn (test.js:1:2)'].join('\n')
+		stack: ['', 'Test.fn (test.js:1:2)'].join('\n')
 	});
 
 	var expectedOutput = [