refactor(lib): merge files

[hasundue]

• refactor(lib): merge semver.ts into dependency.ts
• refactor(lib): merge loader.ts into update.ts
• refactor(lib): merge lib/versions.ts into lib/git.ts

[codecov[bot]]

Codecov Report

Attention: 9 lines in your changes are missing coverage. Please review.

Comparison is base (d1ba3cf) 81.07% compared to head (6e5e462) 83.05%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #56 +/- ## ========================================== + Coverage 81.07% 83.05% +1.97% ========================================== Files 19 16 -3 Lines 613 590 -23 Branches 86 86 ========================================== - Hits 497 490 -7 + Misses 116 100 -16 ``` | [Files](https://app.codecov.io/gh/hasundue/molt/pull/56?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Chiezo) | Coverage Δ | | |---|---|---| | [lib/git.ts](https://app.codecov.io/gh/hasundue/molt/pull/56?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Chiezo#diff-bGliL2dpdC50cw==) | `83.50% <100.00%> (ø)` | | | [lib/update.ts](https://app.codecov.io/gh/hasundue/molt/pull/56?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Chiezo#diff-bGliL3VwZGF0ZS50cw==) | `86.30% <90.24%> (+10.44%)` | :arrow_up: | | [lib/dependency.ts](https://app.codecov.io/gh/hasundue/molt/pull/56?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Chiezo#diff-bGliL2RlcGVuZGVuY3kudHM=) | `72.18% <70.58%> (-0.47%)` | :arrow_down: |

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