Merge pull request #121 from Tvalley71/docs/add-hcv400-p1-e1

Update HCV400 entry in README

Author: Tvalley71

README.md

@@ -24,7 +24,7 @@ Known supported units:
 - HCV300 ALU
 - HCV500 ALU
 - HCV700 ALU
-- HCV400 P2
+- HCV400 P1-E1/P2
 - HCV460 P2/E1
 - RCV320 P1/P2
 - HCH5 MKII