fix(loader): hmr reload on config change

[codecov[bot]]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (51b9251) 88.20% compared to head (9f90895) 88.18%.

Files	Patch %	Lines
packages/loader/src/shared.ts	0.00%	1 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #1308 +/- ## ========================================== - Coverage 88.20% 88.18% -0.02% ========================================== Files 37 37 Lines 5298 5299 +1 Branches 1052 1052 ========================================== Hits 4673 4673 - Misses 625 626 +1 ```

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