Add Lao dictionary

[lingskr]

I added a lao_dict.txt file to ppocr/utils/dict/

[GreatV]

What country does 'Lao' represent?

[lingskr]

“‘老挝’代表哪个国家？”

Laos

[lingskr]

老挝

[GreatV]

Please fix the code-style issue by adding a newline at the end of the file.

[CLAassistant]

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