feat(rust): update nightly version

ashleygwilliams · ashleygwilliams · commit 70e5d54d4d25 · 2021-04-16T15:06:05.000-05:00
diff --git a/RustConfig b/RustConfig
@@ -1 +1 @@
-VERSION=nightly-2020-06-01
+VERSION=nightly-2021-04-15
diff --git a/rust-toolchain b/rust-toolchain
@@ -1 +1 @@
-nightly-2020-06-01
+nightly-2021-04-15
