add reax to DEPRECATED pair style and state when it was removed from LAMMPS

src/pair_deprecated.cpp

@@ -48,6 +48,10 @@ void PairDeprecated::settings(int, char **)
     my_style = hybrid->keywords[hybrid->nstyles];
   }
 
+  if (strcmp(my_style,"reax") == 0) {
+    writemsg(lmp,"\nPair style 'reax' has been removed from LAMMPS "
+                    "after the 12 December 2018 version\n\n",1);
+
   if (strcmp(my_style,"DEPRECATED") == 0) {
     writemsg(lmp,"\nPair style 'DEPRECATED' is a dummy style\n\n",0);
 

src/pair_deprecated.h

@@ -14,6 +14,7 @@
 #ifdef PAIR_CLASS
 
 PairStyle(DEPRECATED,PairDeprecated)
+PairStyle(reax,PairDeprecated)
 
 #else