be explicit on TAXII client version being used

emmanvg · emmanvg · commit 547273208a5f · 2021-04-15T10:27:00.000-04:00
diff --git a/examples/taxii_example.py b/examples/taxii_example.py
@@ -1,4 +1,4 @@
-from taxii2client import Collection
+from taxii2client.v21 import Collection
 
 import stix2
 

Original file line number	Diff line number	Diff line change
`@@ -1,4 +1,4 @@`
`1`		`-from taxii2client import Collection`
	`1`	`+from taxii2client.v21 import Collection`
`2`	`2`
`3`	`3`	`import stix2`
`4`	`4`