Cosmetic endline fix for --version (#254)

This minor, cosmetic fix ensures the output of `--version` ends with a newline even when there's no runtime installed. Perhaps there is a better way, like ending L26 with a newline and chomping the output of `daprd --version`.

pkg/version/version.go

@@ -21,7 +21,7 @@ func GetRuntimeVersion() string {
 
 	out, err := exec.Command(runtimeName, "--version").Output()
 	if err != nil {
-		return "n/a"
+		return "n/a\n"
 	}
 	return string(out)
 }