bump bootstrap => 2019-04-11

Centril · Centril · commit 6a1ca0ba17e5 · 2019-04-17T05:15:00.000+02:00
diff --git a/src/stage0.txt b/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: 2019-03-20
+date: 2019-04-11
 rustc: beta
 cargo: beta
 
