title: Dayjs format with timezone abbreviation i.e. 'z' like in moment.js
body: <p>Trying to migrate from Moment.js to Dayjs but only thing I can't get working is Timezone abbreviation.</p>
  <pre><code>dayjs('2020-07-06T14:30:00.000-04:00').tz(dayjs.tz.guess()).format('Do MMM YYYY [at] HH:MMa z')
  </code></pre>
  <p>Calling the above I would expect <code>6th Jul 2020 at 08:07am EDT</code> but currently I am just getting <code>z</code> where <code>EDT</code> is.</p>
  <p>I have added the utc and timezone plugin and can't see any other plugins needed to make this work, I notice on Dayjs format docs that z isn't listed but searching web I see a lot of folks saying solution is <code>format('', {timeZone})</code> but format doesn't take a second argument??</p>
  <p>Looks like it was added to tz-plugin <a href="https://github.com/iamkun/dayjs/pull/325/files#diff-cad460a5e46a2a48c59e95356c683820R195" rel="noreferrer">https://github.com/iamkun/dayjs/pull/325/files#diff-cad460a5e46a2a48c59e95356c683820R195</a></p>
  <p>Here's a code sandbox with example of issue:
  <a href="https://codesandbox.io/s/hungry-knuth-r58gz" rel="noreferrer">https://codesandbox.io/s/hungry-knuth-r58gz</a></p>
  <p><strong>--- Edit</strong></p>
  <p>Looks like support for tz abbr was removed :(
  <a href="https://github.com/iamkun/dayjs/pull/448/commits/e64c03cea79c579bcd3c4caf235b4724e56614d4" rel="noreferrer">https://github.com/iamkun/dayjs/pull/448/commits/e64c03cea79c579bcd3c4caf235b4724e56614d4</a></p>