Update version variables for release 8.9.0
diff --git a/pelicanconf.py b/pelicanconf.py
index cb17120..a86a110 100755
--- a/pelicanconf.py
+++ b/pelicanconf.py
@@ -10,8 +10,8 @@
 SITEURL = ''
 CURRENTYEAR = date.today().year
 
-LUCENE_LATEST_RELEASE = '8.8.2'
-LUCENE_LATEST_RELEASE_DATE = datetime(2021, 4, 12)
+LUCENE_LATEST_RELEASE = '8.9.0'
+LUCENE_LATEST_RELEASE_DATE = datetime(2021, 6, 17)
 LUCENE_PREVIOUS_MAJOR_RELEASE = '7.7.3'
 
 # This string will be appended to all unversioned css and js resources to prevent caching surprises on edits.