Correct release note versions and update for a couple older point

releases.

RELEASE-NOTES.md

@@ -1,7 +1,7 @@
 RELEASE NOTES
 =============
 
-Version: 1.7.2
+Version: 1.7.4
 --------------
   - Fix generic instantiations of `doArgParse` (#233) on newer Nim compilers
 
@@ -11,6 +11,15 @@ Version: 1.7.2
   - Vaguely robust (if information dropping) solution to
     https://github.com/Alhadis/OSC8-Adoption/issues/13#issuecomment-2333658663
 
+Version: 1.7.3
+--------------
+  - Just a comment in nimble
+
+Version: 1.7.2
+--------------
+  - Make cligen/mslice.hash use `openArray[byte]` hash which is now more
+    reliably fast & has more uniform value distribution.
+
 Version: 1.7.1
 --------------
   - Fix two `cligen/strUt.ecvt` bugs (NOT resulting in bad parses/round trips)