add more tag to _posts/2017-06-13-python-euclidean.md
add more tag to _posts/2017-06-13-python-euclidean.md

pgk/kountanis.com,pgk/kountanis.com,pgk/kountanis.com,pgk/kountanis.com,pgk/kountanis.com,pgk/kountanis.com,pgk/kountanis.com