Merge branch 'master' into feature/options_full

- `newMid2()` now uses the updated `findNextFree(..., ...)` from niknaks

dub.json

@@ -4,10 +4,10 @@
 	],
 	"copyright": "Copyright © 2023, Tristan B. Velloza Kildaire",
 	"dependencies": {
-		"niknaks": ">=0.1.0"
+		"niknaks": ">=0.4.3"
 	},
 	"description": "CoAP library for D",
 	"license": "LGPL v3.0",
 	"name": "doap",
 	"targetType": "library"
-}
+}

source/doap/client/client.d

@@ -132,7 +132,12 @@ public class CoapClient
 
         // If none was available for re-use then find next available
         // ... free and use that (also don't forget to register it)
-        ushort newMid = findNextFree(inUse);
+        ushort newMid;
+        bool gotAvailable = findNextFree(inUse, newMid);
+
+        // FIXME: Add a thing which does something
+        // ... if `gotAvailable` is false
+
         this.mids[newMid] = StopWatch(AutoStart.yes);
 
         return newMid;