Rephrase Security section of readme to avoid offending security conscious
Fixes
@@ -774,7 +774,7 @@ variable.
## Security
-`rustup` is secure enough for the non-paranoid, but it [still needs
+`rustup` is secure enough for most people, but it [still needs
work][s]. `rustup` performs all downloads over HTTPS, but does not
yet validate signatures of downloads.
