diff --git a/.gitignore b/.gitignore
index e69de29..8b7873e 100644
--- a/.gitignore
+++ b/.gitignore
@@ -0,0 +1 @@
+/once_cell-0.1.8.crate
diff --git a/once_cell-0.1.8.crate b/once_cell-0.1.8.crate
deleted file mode 100644
index 5e0526a..0000000
Binary files a/once_cell-0.1.8.crate and /dev/null differ
diff --git a/sources b/sources
index e69de29..68b1530 100644
--- a/sources
+++ b/sources
@@ -0,0 +1 @@
+SHA512 (once_cell-0.1.8.crate) = 068e1f74a2da7377d8b9e5d879e075276cd70dbd07814a6026beb013c556f393e73159ce4de8d8d6b1185676761d830a19e749b8e569aaeb59a87d77bcb0271c