fix: allow script to run on MacOS safely

Author: sanadhis

check_message.sh

@@ -32,7 +32,7 @@ then
 fi
 
 # removing comment lines from message
-MESSAGE=$(sed '/^#/d' "$1")
+MESSAGE=$(sed -i'' '/^#/d' "${1}")
 
 FIRST_WORD=${MESSAGE%% *}
 if [[ "${FIRST_WORD,,}" == merge ]]