patch 8.2.2128: there is no way to do something on CTRL-Z

Problem:    There is no way to do something on CTRL-Z.
Solution:   Add VimSuspend and VimResume autocommand events. (closes #7450)
diff --git a/src/autocmd.c b/src/autocmd.c
index a82659f..c3aa324 100644
--- a/src/autocmd.c
+++ b/src/autocmd.c
@@ -191,6 +191,8 @@
     {"WinLeave",	EVENT_WINLEAVE},
     {"VimResized",	EVENT_VIMRESIZED},
     {"TextYankPost",	EVENT_TEXTYANKPOST},
+    {"VimSuspend",	EVENT_VIMSUSPEND},
+    {"VimResume",	EVENT_VIMRESUME},
     {NULL,		(event_T)0}
 };