[Docs] Update README.md for Alpine linux reference
Add 4 packages as Alpine Linux wiki suggested:
(grep util-linux binutils findutils)
https://wiki.alpinelinux.org/wiki/How_to_get_regular_stuff_working
diff --git a/README.md b/README.md
index 6173ad2..637e104 100644
--- a/README.md
+++ b/README.md
@@ -486,7 +486,7 @@
If installing nvm on Alpine Linux *is* still what you want or need to do, you should be able to achieve this by running the following from you Alpine Linux shell:
```sh
-apk add -U curl bash ca-certificates openssl ncurses coreutils python2 make gcc g++ libgcc linux-headers
+apk add -U curl bash ca-certificates openssl ncurses coreutils python2 make gcc g++ libgcc linux-headers grep util-linux binutils findutils
curl -o- https://raw.githubusercontent.com/creationix/nvm/v0.33.4/install.sh | bash
```
