Add NEWS.md

Author: edwindj

NEWS.md

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+# validatetools 0.5.2
+
+* Added a `NEWS.md` file to track changes to the package.
+
+# validatetools 0.5
+
+* improved dnf parsing: more complex if statements are parsed as dnf, 
+* complex if statements were failing with simplify_conditional: issue #13
+
+# validatetools 0.4.7
+
+* Fix for issue 12, Thanks to Sander Scholtus: substitute_values was failing on conditional statements.
+
+# validatetools 0.4.6
+
+* Fix for issue 11, Thanks to Ton de Waal: simplify_conditional was not working
+correctly on pure categorical rules
+* output of detect_boundary_cat has changed (improved)
+
+# validatetools 0.4.4
+
+* Negative coeficients in linear rules were ignored, now fixed
+
+# validatetools 0.4.3
+
+* Fixed issue #9, bug with pure categorical rules.
+
+# validatetools 0.4.2
+
+* Internal updates for compatability with 'validate' version 0.2.3.
+
+# validatetools 0.4.1
+
+* initial release