Update README.md

add the last step to uninstall  nvm

README.md

@@ -855,7 +855,7 @@ export NVM_DIR="$HOME/.nvm"
 [ -s "$NVM_DIR/nvm.sh" ] && \. "$NVM_DIR/nvm.sh" # This loads nvm
 [[ -r $NVM_DIR/bash_completion ]] && \. $NVM_DIR/bash_completion
 ```
-
+Finally, use `nvm unload` to remove nvm command from your terminal.
 ## Docker For Development Environment
 
 To make the development and testing work easier, we have a Dockerfile for development usage, which is based on Ubuntu 18.04 base image, prepared with essential and useful tools for `nvm` development, to build the docker image of the environment, run the docker command at the root of `nvm` repository: