Fix typo in .gitignore

Change-Id: Id733983dc3bcf9cb61fa99a801861c8015bc8c61
diff --git a/.gitignore b/.gitignore
index e684d2e..6d67701 100644
--- a/.gitignore
+++ b/.gitignore
@@ -30,7 +30,7 @@
 tests/2017-10-04/art
 tests/2017-10-04/art.tar.gz
 third_party/aapt2/
-third_party/aap2.tar.gz
+third_party/aapt2.tar.gz
 third_party/api_database/api_database
 third_party/api_database/api_database.tar.gz
 third_party/api-outlining/simple-app-dump