fix the grep that was incorrect

NEWS.rst

@@ -13,6 +13,8 @@
 
 Make start-py3o option work again.
 
+Odoo 13 set not null errors when testing are ignored the same way it was in other versions.
+
 8.0.1
 -----
 

do_tests

@@ -117,7 +117,7 @@
 fi
 criticals=$(grep ' CRITICAL' -F $logfile -c)
 # exclude ALTER COLUMN xxx set not null that are not real errors
-errors=$(grep ' ERROR' -F $logfile | grep -v "(ALTER COLUMN \"\w*\" SET NOT NULL|unable to set NOT NULL on column)" -c)
+errors=$(grep ' ERROR' -F $logfile | grep -E -v "(ALTER COLUMN \"\w*\" SET NOT NULL|unable to set NOT NULL on column)" -c)
 warnings=$(grep ' WARNING' -F $logfile -c)
 if [[ $criticals -gt 0 ]];
 then