add: the cpp20 standard (#15)

Co-authored-by: Arpit Bhardwaj <proffapt@pm.me>

Author: prrockzed

run

@@ -83,6 +83,7 @@ run() {
 	# C[++] fam specifics
 	default_debugger
 	CFLAGS="-Wall"
+    CPPSTD="-std=c++20"
 	if [[ $DEBUG == true ]]; then
 		CFLAGS+=" -g -O0"
 	else
@@ -102,7 +103,7 @@ run() {
 		fi
 
 	elif [[ ${FILE#*.} == cpp ]]; then
-		"${CXX:=g++}" ${CFLAGS} "$FILE" -o "${FILE%%.*}.out"
+		"${CXX:=g++}" ${CPPSTD} ${CFLAGS} "$FILE" -o "${FILE%%.*}.out"
 		if [[ $DEBUG == true ]]; then
 			"$debugger" "${FILE%%.*}.out"
 		elif [[ $COMPILE != true ]]; then