chore(npm): Use "version" script instead of "postversion" (#101)
chore(npm): Use "version" script instead of "postversion" (#101)

Using postversion was messing up the git tags by changing the sha of the
commit they initially pointed to.

See also https://github.com/bustlelabs/mobiledoc-kit/pull/448
bustlelabs/ember-mobiledoc-editor,bustlelabs/ember-mobiledoc-editor,bustlelabs/ember-content-kit,bustlelabs/ember-content-kit