Platform improvements

[codecov[bot]]

Codecov Report

Patch coverage: 73.73% and project coverage change: -1.20 :warning:

Comparison is base (41584b7) 92.19% compared to head (77be0b7) 90.99%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #289 +/- ## ========================================== - Coverage 92.19% 90.99% -1.20% ========================================== Files 10 11 +1 Lines 986 1022 +36 ========================================== + Hits 909 930 +21 - Misses 77 92 +15 ``` | [Impacted Files](https://app.codecov.io/gh/larryaasen/upgrader/pull/289?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Larry+Aasen) | Coverage Δ | | |---|---|---| | [lib/src/alert\_style\_widget.dart](https://app.codecov.io/gh/larryaasen/upgrader/pull/289?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Larry+Aasen#diff-bGliL3NyYy9hbGVydF9zdHlsZV93aWRnZXQuZGFydA==) | `100.00% <ø> (+12.50%)` | :arrow_up: | | [lib/src/upgrader\_device.dart](https://app.codecov.io/gh/larryaasen/upgrader/pull/289?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Larry+Aasen#diff-bGliL3NyYy91cGdyYWRlcl9kZXZpY2UuZGFydA==) | `11.53% <11.53%> (ø)` | | | [lib/src/appcast.dart](https://app.codecov.io/gh/larryaasen/upgrader/pull/289?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Larry+Aasen#diff-bGliL3NyYy9hcHBjYXN0LmRhcnQ=) | `85.00% <84.61%> (+2.54%)` | :arrow_up: | | [lib/src/upgrader.dart](https://app.codecov.io/gh/larryaasen/upgrader/pull/289?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Larry+Aasen#diff-bGliL3NyYy91cGdyYWRlci5kYXJ0) | `90.00% <92.85%> (-0.07%)` | :arrow_down: | | [lib/src/upgrade\_os.dart](https://app.codecov.io/gh/larryaasen/upgrader/pull/289?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Larry+Aasen#diff-bGliL3NyYy91cGdyYWRlX29zLmRhcnQ=) | `100.00% <100.00%> (ø)` | |

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