More release enhancements
diff --git a/.gitignore b/.gitignore
index 38c95986c21..8118edfd4d5 100644
--- a/.gitignore
+++ b/.gitignore
@@ -8,6 +8,7 @@ dist*/
 /.tox/
 /releases/
 letsencrypt.log
+letsencrypt-auto-source/letsencrypt-auto.sig.lzma.base64
 
 # coverage
 .coverage
diff --git a/letsencrypt-auto-source/letsencrypt-auto.sig.lzma.base64 b/letsencrypt-auto-source/letsencrypt-auto.sig.lzma.base64
deleted file mode 100644
index 037f2f02075..00000000000
--- a/letsencrypt-auto-source/letsencrypt-auto.sig.lzma.base64
+++ /dev/null
@@ -1,6 +0,0 @@
-XQAAAAT//////////wApLArrUzOk5bRHUk0UvMS4xjyZkm3U3qhnKvMbEan7rVeK6yBlbwGeeWFn
-Sw4XT1raGAMNq7cwyJvT7ql93Df7TpuRnxNSbPx7q52GojYyb5Oj1IQ2Y22Mvq41Q4K3kCZcVv+1
-YVKW3OazUn+wCnaoGhDdMFmH0EKbEPSGibba6HJqUoFosaDE2hRZmjqYR/VwwPCtW820L0Qz9PZ7
-DEAZ5VdMmj1+u+bYjDEcZD5+DyWKoLWci8tBXcPGiSvPDdZax/IWmR0GGUOd13gC7uX/HM2dHgbM
-Izh7Y3PPNEzM8Fu2wdXLoMCaYrQcrPAdKhsnyMCDbjxCVbD9LkS17xCq4LUMkcz/fMu3/CRSMMZ7
-gnn//jNQAA==

Automatically removes `SIGFILEBALL` after creating signature in `offline-sigrequest.sh`.
