Update reference paths

history/history-tests.ts

@@ -1,4 +1,4 @@
-/// <reference path="history-1.7.d.ts" />
+/// <reference path="history.d.ts" />
 
 if (!History.enabled) {
     return false;

history/history.d.ts

@@ -22,4 +22,4 @@ interface History {
     go(X);
     log(...messages: any[]);
     debug(...messages: any[]);
-}
+}