add instructions for updating ruby version
add instructions for updating ruby version

moshez/kochiku,square/kochiku,square/kochiku,moshez/kochiku,rudle/kochiku,square/kochiku,rudle/kochiku,rudle/kochiku,IoraHealth/kochiku,moshez/kochiku,IoraHealth/kochiku,IoraHealth/kochiku,rudle/kochiku,square/kochiku,moshez/kochiku