Update README.md

Author: cruse1977

README.md

@@ -35,6 +35,7 @@ Each Plugin Version listed below has been tested with its corresponding NetBox V
 
 | NetBox Version      | Plugin Version |
 |:-------------------:|:--------------:|
+|      4.2.x          |     1.8.0      |
 |      4.1.x          |     1.7.0      |
 |   >= 4.0.2 < 4.1.0  |     1.6.1      |
 |      3.7.x          |     1.5.0      |