Update README for OCaml 5.0.0~rc1

Dockerfile

@@ -2,9 +2,9 @@ FROM ocaml/opam:debian-11-ocaml-5.0
 # Make sure we're using opam-2.1:
 RUN sudo ln -sf /usr/bin/opam-2.1 /usr/bin/opam
 # Ensure opam-repository is up-to-date:
-RUN cd opam-repository && git pull -q origin 2b82c83694d8f1db63e504823646ffcb51562f75 && opam update
+RUN cd opam-repository && git pull -q origin 7682a310ca21fc2de92c7fb88672b48d15e03166 && opam update
 # Switch to OCaml 5.0.0 (beta)
-RUN opam pin remove ocaml-variants && opam install ocaml-base-compiler.5.0.0~beta2 --update-invariant
+RUN opam pin remove -n ocaml-variants && opam install ocaml-base-compiler.5.0.0~rc1 --update-invariant
 # Install utop for interactive use:
 RUN opam install utop fmt
 # Install Eio's dependencies (adding just the opam files first to help with caching):

README.md

@@ -109,17 +109,17 @@ Remember that you can always fall back to using Lwt libraries to provide missing
 
 ## Getting OCaml 5.0
 
-You'll need OCaml 5.0.0~beta2.
+You'll need OCaml 5.0.0~rc1.
 You can either install it yourself or build the included [Dockerfile](./Dockerfile).
 
 To install it yourself:
 
 1. Make sure you have opam 2.1 or later (run `opam --version` to check).
 
-2. Use opam to install OCaml 5.0.0~beta2:
+2. Use opam to install OCaml 5.0.0~rc1:
 
    ```
-   opam switch create 5.0.0~beta2
+   opam switch create 5.0.0~rc1
    ```
 
 ## Getting Eio