add bubble sort
Merge branch 'master' of https://github.com/wyh267/algorithms

Conflicts:
	Makefile
add selection sort
Merge branch 'master' of https://github.com/wyh267/algorithms into wyh267-master

Conflicts:
	Makefile
update bubble-sort
Merge branch 'master' of https://github.com/wyh267/algorithms into wyh267-master

Conflicts:
	Makefile
Merge branch 'wyh267-master'
update selection sort
update readme.md
update selection sort
update bubble sort
Merge branch 'master' into develop