Add a `make release` target

Should help with #192

Makefile

@@ -4,6 +4,9 @@ BIN := ./_build/default/bin/main.exe
 default: boot.exe
 	./boot.exe -j 4 --dev
 
+release: boot.exe
+	./boot.exe -j 4
+
 boot.exe: bootstrap.ml
 	ocaml bootstrap.ml
 

README.md

@@ -116,11 +116,13 @@ $ opam install jbuilder
 You can also build it manually with:
 
 ```sh
-$ make
+$ make release
 $ make install
 ```
 
-Note however that `make install` requires the `opam-installer` tool.
+Note however that `make install` requires the `opam-installer`
+tool. Running simply `make` will build jbuilder using the development
+settings.
 
 If you do not have `make`, you can do the following: