added news

Author: Pietro Vertechi

NEWS.md

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+# NEWS
+
+## Version 0.2.0
+
+### Breaking
+
+- Renamed `columns` to `fieldarrays`
+
+### New features
+
+- Added `collect_fieldarrays` function to collect an iterable of structs into a `StructArray` without having to allocate an array of structs
+- `StructArray{T}(undef, dims)` and `StructArray(v::AbstractArray)` now support an `unwrap` keyword argument to specify on which types to do recursive unnesting of array of structs to struct of arrays
+