update the readme

Author: maurymarkowitz

README.MD

@@ -134,9 +134,9 @@ There are a number of limitations in these importers as the various formats supp
 
 | Extension(s) | Format | Read | Write |
 |---|---|---|---|
-| `.nec` `.deck` `.4nec` | OpenNEC / NEC-2 deck | ✓ | ✓ |
-| `.nec2` | NEC-2 (stripped, numeric) | ✓ | ✓ |
-| `.nec4` | NEC-4 | ✓ | stub |
+| `.nec` `.deck` `.4nec` | OpenNEC / 4nec2 deck | ✓ | ✓ |
+| `.nec2` | NEC-2 | ✓ | ✓ |
+| `.nec4` | NEC-4 | ✓ | ✓ |
 | `.maa` `.mma` | MMANA-GAL | ✓ | ✓ |
 | `.nc` | cocoaNEC | ✓ | ✓ |
 | `.yo` `.ant` `.yag` | Yagi Optimizer | ✓ | ✓ |
@@ -147,7 +147,6 @@ There are a number of limitations in these importers as the various formats supp
 
 "Recognised" means the extension is detected and a helpful error is shown, but no import/exporter exists yet.
 
-
 OpenNEC concept
 ---------------
 OpenNEC's code ultimately traces its history to the NEC-2 Fortran code released by Lawrence Livermore in the early 1980s. A port to C was made by Neoklis Kyriazis in the nec2c program which was first released on 20 August 2003. OpenNEC was forked from the 1.3 version of nec2c, released in 2014. Although initially conceived a simple update, OpenNEC was eventually completely re-written, but an effort was made to keep the overall layout of the project.