Fix cpulimit invocation

Close #574

Author: cyrus-and

_gtfobins/cpulimit

@@ -2,11 +2,11 @@
 functions:
   shell:
   - code: |-
-      cpulimit -l 100 -f /bin/sh
+      cpulimit -l 100 -f -- /bin/sh
     contexts:
       sudo:
       suid:
         code: |-
-          cpulimit -l 100 -f /bin/sh -p
+          cpulimit -l 100 -f -- /bin/sh -p
       unprivileged:
 ...