Add ignore dependency

Author: joshchoo

Cargo.lock

@@ -1,6 +1,6 @@
 [package]
 name = "aosp-missing-blobs"
-version = "0.3.0"
+version = "0.4.0"
 authors = ["Josh Choo <dev@joshuous.com>"]
 edition = "2018"
 description = """
@@ -14,4 +14,5 @@ repository = "https://github.com/joshuous/aosp-missing-blobs"
 
 [dependencies]
 clap = "2.33"
-goblin = "0.4"
+goblin = "0.4"
+ignore = "0.4"