Add a changelog

Changelog.txt

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+Version 1.3, TODO
+------------------------
+- [added] live log in the GUI showing the output of FFmpeg.
+- [added] re-added a batch mode and a CLI interface.
+- [added] Allow a file to be drag and dropped on the input text box.
+
+Version 1.2, 2018-04-29
+------------------------
+- [fixed] partial image sometimes being saved after cancelling.
+
+Version 1.1, 2018-04-22
+------------------------
+- Rewritten from scratch.
+- [changed] now use FFmpeg instead of DirectShow
+		- this means Windows 10 is now properly supported
+		- this also means virtually all video formats can now be read!
+- [added] ability to generate smooth barcodes.
+
+Version 0.5, 2011-02-14
+------------------------
+- Second public release.
+- [changed] multi-threaded barcode generation.
+
+Version 0.1, 2011-03-20
+------------------------
+- First public release.