v2.5.6

• dartfmt
• test_coverage: ^0.4.2

v2.5.5

• Change isEmptyValue to is isEmptyObject.
• Added isNotEmptyObject.

v2.5.4

- Fix `MimeType.parse` when parameter `mimeType` is empty and `defaultMimeType` is null.
- Fix `DataURLBase64.asDataURLString`
- dartfmt.

v2.5.3

• fix buildStringPattern() extraParameters issue.

v2.5.1

Math.mean() returns 0 on empty lists.