modify file name
Merge branch 'master' of https://github.com/sotetsuk/ProjectEuler

Conflicts:
	PE001.py
	PE002.py
	PE003.py
	PE004.py
	PE005.py
	PE006.py
	PE007.py
	PE008.py
	PE009.py
	PE010.py
	PE011.py
	PE012.py
	PE013.py
	PE014.py
	PE015.py
	PE016.py
	PE017.py
	PE018.go
	PE019.py
	PE020.py
	PE021.go
	PE022.py
	PE1.py
	PE10.py
	PE11.py
	PE12.py
	PE13.py
	PE14.py
	PE15.py
	PE16.py
	PE17.py
	PE18.go
	PE19.py
	PE2.py
	PE20.py
	PE21.go
	PE22.py
	PE3.py
	PE4.py
	PE5.py
	PE6.py
	PE7.py
	PE8.py
	PE9.py
	go/PE18.go
	go/PE21.go
	py/PE1.py
	py/PE10.py
	py/PE11.py
	py/PE12.py
	py/PE13.py
	py/PE14.py
	py/PE15.py
	py/PE16.py
	py/PE17.py
	py/PE19.py
	py/PE2.py
	py/PE20.py
	py/PE22.py
	py/PE3.py
	py/PE4.py
	py/PE5.py
	py/PE6.py
	py/PE7.py
	py/PE8.py
	py/PE9.py