[Docs] update alpine environment installation info [skip ci]

Author: PeterDaveHello

README.markdown

@@ -434,8 +434,8 @@ There is a `-s` flag for `nvm install` which requests nvm download Node source a
 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 bash
-wget -qO- https://raw.githubusercontent.com/creationix/nvm/v0.32.1/install.sh | /bin/bash
+apk add -U wget bash ca-certificates openssl ncurses coreutils python2 make gcc g++
+wget -qO- https://raw.githubusercontent.com/creationix/nvm/v0.32.1/install.sh | bash
 ```
 
 The Node project has some desire but no concrete plans (due to the overheads of building, testing and support) to offer Alpine-compatible binaries.