message: fix(versionist): Ignore case of Change-Type value
  There's a commit that slipped in (sorry) with a capitalised
  Change-Type value of "Patch". This avoids versionist erroring,
  by always lowercasing that value.
  Change-Type: PATCH
diff: @@ -38,7 +38,11 @@ module.exports = {
  },
  getIncrementLevelFromCommit: (commit) => {
  - return commit.footer['Change-Type']
  + if (/none/i.test(commit.footer['Change-Type'])) {
  + return null
  + }
  + return commit.footer['Change-Type'] &&
  + _.toLower(commit.footer['Change-Type'])
  },
  transformTemplateData: (data) => {
  