Fix .travis.sh test for 3.22

Author: fredemmott

.travis.sh

@@ -10,6 +10,7 @@ hh_server --check $(pwd)
 hhvm -d hhvm.php7.all=0 vendor/bin/phpunit tests/
 hhvm -d hhvm.php7.all=1 vendor/bin/phpunit tests/
 
+HHVM_VERSION=$(hhvm --php -r 'echo HHVM_VERSION_ID;' 2>/dev/null);
 if [ $HHVM_VERSION -ge 32200 -a $HHVM_VERSION -lt 32300 ]; then
   echo enable_experimental_tc_features = optional_shape_field, unknown_fields_shape_is_not_subtype_of_known_fields_shape >> .hhconfig
   hh_server --check $(pwd)