Added MAP_ADD opcode to list of opcodes in safeeval.py (Gallopsled#2243)

Author: fercevik729

pwnlib/util/safeeval.py

@@ -2,7 +2,7 @@
 
 _const_codes = [
     'POP_TOP','ROT_TWO','ROT_THREE','ROT_FOUR','DUP_TOP',
-    'BUILD_LIST','BUILD_MAP','BUILD_TUPLE','BUILD_SET',
+    'BUILD_LIST','BUILD_MAP', 'MAP_ADD', 'BUILD_TUPLE','BUILD_SET',
     'BUILD_CONST_KEY_MAP', 'BUILD_STRING',
     'LOAD_CONST','RETURN_VALUE','STORE_SUBSCR', 'STORE_MAP',
     'LIST_TO_TUPLE', 'LIST_EXTEND', 'SET_UPDATE', 'DICT_UPDATE', 'DICT_MERGE',