CHANGELOG.md: Changes upto v0.0.3

Includes changes upto v0.0.3
Contributors are sorted based upon the number of commits

CHANGELOG.md

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+UIP Changelog
+=============
+
+
+**Version: "0.0.3"**
+====================
+Changes:
+--------
+- Added Experimental GUI
+- Fixed permissions on linux for storing downloaded images
+- Fixed bug on debian systems
+- Added more image sources
+
+
+**Contributors**
+----------------
+- [abhsag24](https://github.com/abhsag24)
+- [nkprince007](https://github.com/nkprince007)
+- [nemaniarjun](https://github.com/nemaniarjun)
+- [trump16](https://github.com/trump16)
+- [akshatnitd](https://github.com/akshatnitd)
+- [Aniq55](https://github.com/Aniq55)
+- [DarkSouL11](https://github.com/DarkSouL11)
+- [hassi2016](https://github.com/hassi2016)
+- [teja-315](https://github.com/teja-315)
+- [hackrush01](https://github.com/hackrush01)
+- [RyuujenJakka](https://github.com/RyuujenJakka)
+- [sreeparna0795](https://github.com/sreeparna0795)
+- [mohitshaw](https://github.com/mohitshaw)
+- [nehaNIT](https://github.com/nehaNIT)
+- [Swati707](https://github.com/Swati707)
+- [sonalkr132](https://github.com/sonalkr132)
+
+