Move Shift + Insert to shortcut

Shift + Insert is used like a hot key for paste the selection, so it is more
logical move it to shortcut array instead of having special code for it.
---
 config.def.h |    1 +
 st.c         |   13 +++----------
 2 files changed, 4 insertions(+), 10 deletions(-)

1 files changed, 1 insertions, 0 deletions

diff --git a/config.def.h b/config.def.h
index ee677a5..3bf35d9 100644
--- a/config.def.h
+++ b/config.def.h
@@ -93,5 +93,6 @@ static Shortcut shortcuts[] = {
         /* modifier             key             function        argument */
         { MODKEY|ShiftMask,     XK_Prior,       xzoom,          {.i = +1} },
         { MODKEY|ShiftMask,     XK_Next,        xzoom,          {.i = -1} },
+        { ShiftMask,            XK_Insert,      selpaste,       {.i =  0} },
 };