* Added `background` option and prop.
This optional color specifies which background to use when removing the
alpha channel if the output format doesn't support transparency.
* Modified existing tests
* Fixed wrong dimensions in tests
* Fixing a few instances of jpeg vs jpg
* Added color checking
* working on the tests
* tests are now passing
* Adding tests
* Added tests for background color
* no need to test with subpath
* Added fixture
* Renamed test fixture for background-color
* skipping test until fixed
* Typo
* Working on tests
* tests are passing
* Updated readme and added changeset
* Updated lockfile
* Updated lockfile
* Updated lockfile
Co-authored-by: Tony Sullivan <tony.f.sullivan@outlook.com>
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