add String alias

Author: vitamin

src/basic_string/package.d

@@ -24,6 +24,13 @@ if(T.length == 1){
 
 
 
+/**
+    Standard utf-8 string type (alias to `BasicString!char`).
+*/
+alias String = BasicString!char;
+
+
+
 /**
 	The `BasicString` is the generalization of struct string for character of type `char`, `wchar` or `dchar`.