remove spurious trailing space in t.end error message

Author: novemberborn

lib/test.js

@@ -203,7 +203,7 @@ Object.defineProperty(Test.prototype, 'end', {
 			return this._end.bind(this);
 		}
 
-		throw new Error('t.end is not supported in this context. To use t.end as a callback, you must use "callback mode" via `test.cb(testName, fn)` ');
+		throw new Error('t.end is not supported in this context. To use t.end as a callback, you must use "callback mode" via `test.cb(testName, fn)`');
 	}
 });