Update filter.py

Seems the import was wrong

Author: SaltyHash123

examples/searchcommands_template/bin/filter.py

@@ -5,7 +5,7 @@
 
 sys.path.insert(0, os.path.join(os.path.dirname(__file__), "..", "lib"))
 from splunklib.searchcommands import \
-    dispatch, StreamingCommand, Configuration, Option, validators
+    dispatch, EventingCommand, Configuration, Option, validators
 
 
 @Configuration()