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 e754e75 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!