Renovate: Ignore snowpack.

Change-Id: Iea0fad67d5444f93a6bc41a0878acf62c569bae5
diff --git a/renovate.json b/renovate.json
index f59f762..12b1f0c 100644
--- a/renovate.json
+++ b/renovate.json
@@ -1,3 +1,4 @@
 { "$schema": "https://docs.renovatebot.com/renovate-schema.json"
 , "extends": ["local>benkard/.github:renovate-config"]
+, "ignoreDeps": ["snowpack"]
 }