Update NEWS for v3.0

NEWS

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+Version 3.0
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+
+- [macOS] Full support for macOS 11 Big Sur and Apple Silicon (M1).
+- Completely reworked welcome screen.
+- Modernized user inteface and icons.
+- Much improved opening of recently edited files.
+- Automatic reloading of files modified outside of Poedit.
+- Completely new source code occurrences viewers with syntax highlighting for
+  virtually all programming languages used with gettext.
+- Editing area now indicates source and translation string lengths.
+- Full python-format support for PO files.
+- Further improvements to XLIFF handling.
+
+
 Version 2.4.3
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