Update data_synthesis.md

doc/doc_ch/data_synthesis.md

@@ -4,4 +4,5 @@
 - [SynthText](https://github.com/ankush-me/SynthText)
 - [SynthText_Chinese_version](https://github.com/JarveeLee/SynthText_Chinese_version)
 - [TextRecognitionDataGenerator](https://github.com/Belval/TextRecognitionDataGenerator)
-- [SynthText3D](https://github.com/MhLiao/SynthText3D)
\ No newline at end of file
+- [SynthText3D](https://github.com/MhLiao/SynthText3D)
+- [UnrealText](https://github.com/Jyouhou/UnrealText/)