m-x -> M-x

Author: bbatsov

README.md

@@ -459,7 +459,7 @@ inf-clojure largely needs to know the REPL type so it can format the
 correct calls. Most end up in `(planck.repl/doc [symbol])` or
 `(cljs.repl/doc ...)` so its important that the REPL type is set
 correctly. This REPL type exists in the process buffer (REPL) and the
-source buffers as a cache. If you have problems, run `m-x
+source buffers as a cache. If you have problems, run `M-x
 inf-clojure-set-repl-type` from the source buffer to set the REPL type
 in both buffers. To see how simple inf-clojure is, look at
 `inf-clojure-repl-features` to see largely how things are laid out.