markdown fix

README.md

@@ -20,7 +20,7 @@ files in there directly if you don't need the API documentation.
 Libostd is built using the supplied C++ build tool. You need to compile the
 build tool first using the compiler you will use to build the library itself:
 
-~~~{.cc}
+~~~
 c++ build.cc -o build -std=c++1z
 ~~~