Make it clear when a leprechaun dodges your attack

It was not obvious what was happening when a leprechaun dodged
your attack. Add a message to explicitly spell it out.
Code by aosdict.

doc/fixes36.2

@@ -145,6 +145,7 @@ sortloot option has been enhanced to improve object ordering; primarily,
 	items of undiscovered type come out before items of discovered type
 	within each class or sub-class of objects
 YAFM when stumbling on an undetected monster while hallucinating
+Make it clear when a leprechaun dodges your attack
 
 
 Code Cleanup and Reorganization

src/uhitm.c

@@ -412,8 +412,10 @@ register struct monst *mtmp;
         && !mtmp->mconf && mtmp->mcansee && !rn2(7)
         && (m_move(mtmp, 0) == 2 /* it died */
             || mtmp->mx != u.ux + u.dx
-            || mtmp->my != u.uy + u.dy)) /* it moved */
+            || mtmp->my != u.uy + u.dy)) { /* it moved */
+        You("miss wildly and stumble forwards.");
         return FALSE;
+    }
 
     if (Upolyd)
         (void) hmonas(mtmp);