Update NEWS for windshaft 4.8.3

NEWS.md

@@ -8,13 +8,14 @@ Notice:
 
 New features:
 - CI tests with Ubuntu Xenial + PostgreSQL 10.1 and Ubuntu Precise + PostgreSQL 9.5
-- Upgrades Windshaft to [4.8.2](https://github.com/CartoDB/Windshaft/blob/4.8.2/NEWS.md#version-482) which includes:
+- Upgrades Windshaft to [4.8.3](https://github.com/CartoDB/Windshaft/blob/4.8.3/NEWS.md#version-483) which includes:
   - Update internal deps.
   - A fix in mapnik-vector-tile to avoid grouping together properties with the same value but a different type.
   - Performance improvements in the marker symbolizer (local cache, avoid building the collision matrix when possible).
   - MVT: Disable simplify_distance to avoid multiple simplifications.
   - Fix a bug with zero length lines not being rendered when using the marker symbolizer.
   - Reduce size of npm package
+  - Omit attributes validation in layers with aggregation to avoid potentially long instantiation times
 - Upgrades Camshaft to [0.61.11](https://github.com/CartoDB/camshaft/releases/tag/0.61.11):
   - Use Dollar-Quoted String Constants to avoid Syntax Error while running moran analyses. [0.61.10](https://github.com/CartoDB/camshaft/releases/tag/0.61.10)
   - Quote name columns when performing trade area analysis to avoid Syntax Errors. [0.61.11](https://github.com/CartoDB/camshaft/releases/tag/0.61.11)