Remove invalid supports_diff parameter (v1.3.2)

- AnsibleModule.__init__() does not accept supports_diff or supports_diff_mode
- Diff mode support is declared via attributes in DOCUMENTATION
- This was the actual root cause of the error
- Bump version to 1.3.2

galaxy.yml

@@ -3,7 +3,7 @@
 
 namespace: "valid"
 name: "nsupdate_zone"
-version: 1.3.1
+version: 1.3.2
 readme: README.md
 authors:
   - Dan Kercher