Update NEWS.txt

Author: drunsinn

NEWS.txt

@@ -1,9 +1,11 @@
-## TODO, xx.yyyy
-* increase minimal python version to 3.7
+## TODO v0.5.0, xx.yyyy
+* increase minimal python version to 3.8
 * add type hints to all functions
 * improve docstrings to include type hints
 * replace magic numbers for ice type, diagram region and unit system with enumerations
 * restructure imports
+* switch to pyproject.toml
+** move file location of demo scripts
 
 ## v0.4.9, 05.2022
 * fix issue with missing unit conversion in h_px and h_tx