durationToSeconds and secondsToDuration are no longer exported

[rianadon]

Absolutely love the library and I'm glad it got a new release recently!

However, after pulling the latest version I noticed that the functions secondsToDuration and durationToSeconds no longer import.

(!) Plugin typescript: @rollup/plugin-typescript TS2305: Module '"custom-card-helpers"' has no exported member 'durationToSeconds'.
src/helpers.ts: (2:10)

2 import { durationToSeconds, formatTime, HomeAssistant } from "custom-card-helpers";
           ~~~~~~~~~~~~~~~~~

test/util.ts: (1:10)

1 import { durationToSeconds } from "custom-card-helpers";
           ~~~~~~~~~~~~~~~~~

(!) Plugin typescript: @rollup/plugin-typescript TS2305: Module '"custom-card-helpers"' has no exported member 'secondsToDuration'.
src/timer-bar-entity-row.ts: (6:51)

6 import { HomeAssistant, hasConfigOrEntityChanged, secondsToDuration, computeStateDisplay } from 'custom-card-helpers';
                                                    ~~~~~~~~~~~~~~~~~

I was poking around and it seems that https://github.com/custom-cards/custom-card-helpers/commit/e754e7523c73fdff5b0ef7958060508b24b9318d might have something to do with the issue.

It looks like secondsToDuration has been removed from index.m.js even though it is still in the source code:

Thank you!