v1.3.0

• 'Computed Columns' and 'Lines computed filter' formula validation and error notification
• now() custom function available for 'Computed Columns' and 'Lines computed filter' formulas (useful to compute duration with a timestamp field: now() - col['timestamp'])
• Remove 'Calculate metrics for every bucket/level' checkbox on Kibana 7.x (like on Data Table)
• Fix 'Filter for value' feature on Kibana 7.x (#39)
• Fix 'Lines computed filter' feature on Kibana 5.x to 6.3 (#42)