Auto merge of #66327 - pietroalbini:beta-no-dev, r=Mark-Simulacrum

[beta] Download 1.39.0 from static

This PR comments out `dev: 1` from the beta channel's `stage0.txt`.

r? @Mark-Simulacrum

Author: bors

src/stage0.txt

@@ -12,7 +12,7 @@
 # source tarball for a stable release you'll likely see `1.x.0` for rustc and
 # `0.x.0` for Cargo where they were released on `date`.
 
-date: 2019-11-04
+date: 2019-11-07
 rustc: 1.39.0
 cargo: 0.40.0
 
@@ -34,4 +34,4 @@ cargo: 0.40.0
 # looking at a beta source tarball and it's uncommented we'll shortly comment it
 # out.
 
-dev: 1
+#dev: 1