send stderr to the log too

Author: Charlie Somerville

script/cibuild

@@ -5,7 +5,7 @@ if [ -z "$CORES" ]; then
 fi
 
 function Q {
- if ! "$@" > /tmp/ruby_ci_log; then
+ if ! "$@" &> /tmp/ruby_ci_log; then
  cat /tmp/ruby_ci_log
  exit 1
  fi