Ensure --dry-run flag is honored

bin/xmet-spc-ingest

@@ -26,6 +26,7 @@ for path in args.path:
         try:
             outlook = parser.parse(fh.read())
 
+            if not args.dry_run:
                 db.add(outlook)
 
                 for probability in outlook.probabilities:
@@ -46,4 +47,5 @@ for path in args.path:
             else:
                 raise
 
-db.commit()
+if not args.dry_run:
+    db.commit()