Merge pull request #980 from rust-lang/dependabot/cargo/once_cell-1.5.1

Cargo.lock

@@ -1031,9 +1031,9 @@ dependencies = [
 
 [[package]]
 name = "once_cell"
-version = "1.5.0"
+version = "1.5.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "95c43eba5c640051fbde86a3377842386a94281df3ff0a5f0365c2075ed5c66f"
+checksum = "f53cef67919d7d247eb9a2f128ca9e522789967ef1eb4ccd8c71a95a8aedf596"
 
 [[package]]
 name = "opaque-debug"