[guava] Update .gitignore

[Zbigniew Jędrzejewski-Szmek]

commit f9eeadd11363a833c9b867c07db89943ae37588b
Author: Zbigniew Jędrzejewski-Szmek <zbyszek at in.waw.pl>
Date:   Wed Jan 7 00:07:02 2015 -0500

    Update .gitignore

 .gitignore |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/.gitignore b/.gitignore
index 71527eb..dc08db2 100644
--- a/.gitignore
+++ b/.gitignore
@@ -4,3 +4,4 @@
 /guava-15.0.tar.xz
 /guava-17.0.tar.xz
 /v18.0.tar.xz
+/v18.0.tar.gz