bring back the wasm executable at the root of the interpreter directory

when running make

Author: redianthus

interpreter/Makefile

@@ -34,6 +34,8 @@ ci:		all jslib
 .PHONY:		$(NAME).exe
 $(NAME).exe:
 	dune build $@
+	rm -f $(NAME)
+	cp $(BUILDDIR)/$(OPT) $(NAME)
 
 .PHONY:		smallint.exe
 smallint.exe:

interpreter/README.md

@@ -24,7 +24,7 @@ Once you have OCaml, simply do
 ```
 make
 ```
-You'll get an executable named `_build/default/wasm.exe`.
+You'll get an executable named `./wasm`.
 To run the test suite,
 ```
 make test