Fix silinternational#90 keep "placementConstraints" from old task def…

…inition

ecs-deploy

@@ -313,7 +313,7 @@ NEW_DEF_JQ_FILTER="family: .family, volumes: .volumes, containerDefinitions: .co
 
 # Some options in task definition should only be included in new definition if present in
 # current definition. If found in current definition, append to JQ filter.
-CONDITIONAL_OPTIONS=(networkMode taskRoleArn)
+CONDITIONAL_OPTIONS=(networkMode taskRoleArn placementConstraints)
 for i in "${CONDITIONAL_OPTIONS[@]}"; do
   re=".*${i}.*"
   if [[ "$DEF" =~ $re ]]; then