[zanata/zanata-platform] 42cf89: Update to TypeScript 2.7.1

[GitHub]

  Branch: refs/heads/typescript
  Home:   https://github.com/zanata/zanata-platform
  Commit: 42cf89b1c66ecd8de25ec6c19d02d485fe3ae5b0
      https://github.com/zanata/zanata-platform/commit/42cf89b1c66ecd8de25ec6c19d02d485fe3ae5b0
  Author: Sean Flanigan <sflaniga at redhat.com>
  Date:   2018-02-01 (Thu, 01 Feb 2018)

  Changed paths:
    M server/zanata-frontend/src/package.json
    M server/zanata-frontend/src/yarn.lock

  Log Message:
  -----------
  Update to TypeScript 2.7.1