README.md typo
README.md typo

Changed principals to principles.
kaji-project/adagios,zengzhaozheng/adagios,kb2ma/adagios,kaji-project/adagios,opinkerfi/adagios,opinkerfi/adagios,kaji-project/adagios,kb2ma/adagios,zengzhaozheng/adagios,zengzhaozheng/adagios,opinkerfi/adagios,kb2ma/adagios,kaji-project/adagios,opinkerfi/adagios,zengzhaozheng/adagios,kb2ma/adagios