fix quoting of ruby env command #356
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I use chruby and zsh. Without this, it was running
/bin/zsh -lic 'chruby-exec "3.1" -- ruby' -rjson -e "printf(%{RUBY_ENV_ACTIVATE%sRUBY_ENV_ACTIVATE}, JSON.dump([ENV.to](http://env.to/)_h))"which just hangs indefinitely, because the-rjson ...arguments were getting passed to zsh, and zsh isn't passing them through. The entire activation command needs to be passed in tomakeShellCommandso that it can properly quote the entire command going to the shell.