Move Cursor and TokenBuffer into buffer module
diff --git a/src/tt.rs b/src/tt.rs
index 043b22f..11c3e3c 100644
--- a/src/tt.rs
+++ b/src/tt.rs
@@ -7,7 +7,7 @@
 // except according to those terms.
 
 use proc_macro2::{Delimiter, TokenNode, TokenStream, TokenTree};
-use cursor::Cursor;
+use buffer::Cursor;
 use parse_error;
 use synom::PResult;
 use MacroDelimiter;