Fix breakage when the stderr-nocaret feature flag is enabled. (#24)

Author: sjuxax

functions/_pisces_lookup.fish

@@ -9,6 +9,6 @@ function _pisces_lookup -a pos len -d "Returns the text at the given position re
     set input (commandline -b)
 
     # NOTE: it's important to quote $input, because it may have newlines
-    string sub --start (math "$cur + $pos + 1") --length $len -- "$input" ^/dev/null
+    string sub --start (math "$cur + $pos + 1") --length $len -- "$input" 2>/dev/null
     or echo '' # if it's out of bounds (probably better to return cut part)
 end