updated NEWS.md for CRAN

NEWS.md

@@ -11,7 +11,12 @@ Minor changes before major release
 # RStoolbox 0.4.0
 Rewrite of `RStoolbox`, migration from `raster` to `terra` and `sp` to `sf`
 
-## Fixes:
+# New:
+* RStoolbox moved on from the outdated `sp` and `raster` packages to `sf` and `terra` to ensure long term support of the tools.
+* Thrown out unnecessary libraries
+
+# Fixes:
+* `rasterPCA()`: Fixed a bug that caused the method and its unit tests to fail on Linux due to a corrupted covariance matrix calculated previously with `terra::layerCor()`
 * `superClass()` unable to predict when there is NA in raster data (closes #102, reported by @bappa10085)
 
 # RStoolbox 0.3.0