Update README.md

Author: crackedmind

README.md

@@ -1,11 +1,11 @@
 Some resources:
 
 1. [C++ Modules in VS 2015 Update 1](https://blogs.msdn.microsoft.com/vcblog/2015/12/03/c-modules-in-vs-2015-update-1/)
-2. [Latest draft](http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2017/n4637.pdf)
+2. [Latest draft](http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2017/n4647.pdf)
 
 Problems in Visual C++ 2017:
 
 1. Using Standard Library modules:
 
     * internal compiler error when using std::string in module
-    * link errors using std::ofstream
+    * link errors using std::ofstream