loongson/pypi: links for rgb-to-hex

loongson/mirror rgb_to_hex-0.0.6.tar.gz
loongson/mirror rgb_to_hex-0.0.5.tar.gz
loongson/mirror rgb_to_hex-0.0.4.tar.gz
loongson/mirror rgb_to_hex-0.0.3.tar.gz
loongson/mirror rgb_to_hex-0.0.2.tar.gz
loongson/mirror rgb_to_hex-0.0.1.tar.gz