Fix install install instructions via Go (#475)

Author: zikalino

README.md

@@ -69,7 +69,7 @@ If you are to visit the `vultr-cli` [releases](https://github.com/vultr/vultr-cl
 
 You will need Go installed on your machine in order to work with the source (and make if you decide to pull the repo down).
 
-`go get -u github.com/vultr/vultr-cli/v3`
+`go install github.com/vultr/vultr-cli/v3@latest`
 
 Another way to build from source is to