diff --git a/.gitignore b/.gitignore
index 3991d07..033ac24 100644
--- a/.gitignore
+++ b/.gitignore
@@ -3,5 +3,4 @@
 /lib/ed-diff/target
 /lib/context-diff/target
 /lib/unified-diff/target
-Cargo.lock
 *.swp
diff --git a/Cargo.lock b/Cargo.lock
new file mode 100644
index 0000000..2ae28d9
--- /dev/null
+++ b/Cargo.lock
@@ -0,0 +1,33 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "diff"
+version = "0.1.13"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "56254986775e3233ffa9c4d7d3faaf6d36a2c09d30b20687e9f88bc8bafc16c8"
+
+[[package]]
+name = "diffutils"
+version = "0.3.0"
+dependencies = [
+ "diff",
+ "pretty_assertions",
+]
+
+[[package]]
+name = "pretty_assertions"
+version = "1.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "af7cee1a6c8a5b9208b3cb1061f10c0cb689087b3d8ce85fb9d2dd7a29b6ba66"
+dependencies = [
+ "diff",
+ "yansi",
+]
+
+[[package]]
+name = "yansi"
+version = "0.5.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "09041cd90cf85f7f8b2df60c646f853b7f535ce68f85244eb6731cf89fa498ec"