chore: update the target compiler version to nightly-2020-02-19

yvt · yvt · commit b8b041b6443e · 2021-02-19T20:42:43.000+09:00
diff --git a/rust-toolchain b/rust-toolchain
@@ -1 +1 @@
-nightly-2021-01-30
+nightly-2021-02-19
