include node_modules so release .zip is deployable

node_modules/tstl/iterator/IBidirectionalIterator.d.ts

@@ -0,0 +1,18 @@
+/**
+ * @packageDocumentation
+ * @module std
+ */
+import { IForwardIterator } from "./IForwardIterator";
+/**
+ * Bidirectional iterator.
+ *
+ * @author Jeongho Nam - https://github.com/samchon
+ */
+export interface IBidirectionalIterator<T, Iterator extends IBidirectionalIterator<T, Iterator> = IBidirectionalIterator<T, any>> extends IForwardIterator<T, Iterator> {
+    /**
+     * Get previous iterator.
+     *
+     * @return The previous iterator.
+     */
+    prev(): Iterator;
+}