Remove unused import from Clippy versions.py file
diff --git a/util/versions.py b/util/versions.py
index 7a21a84..fee0d29 100755
--- a/util/versions.py
+++ b/util/versions.py
@@ -2,7 +2,6 @@
 
 from string import Template
 import argparse
-import json
 import os
 import sys