Fix up signatures

[hexmode]

Also add phpunit dependency, add test target, fix up phpunit.xml.dist, and add changelog entry.

Fixes #412

[osnard]

@DeepDiver1975 Can we please get this merged and released? This issue prevents me from updating production code to 1.x

[DeepDiver1975]

Generally speaking I'd prefer to have dedicated pull requests for dedicated topics/issues.
Let's see what CI tells us and then we cut it into dedicated chunks.

THX a lot

[DeepDiver1975]

The hard dependency on phpunit causes issues to run ci on php 7.x .... please remove.

[hexmode]

Generally speaking I'd prefer to have dedicated pull requests for dedicated topics/issues. Let's see what CI tells us and then we cut it into dedicated chunks.

I'll roll back all but my own changes here.

[hexmode]

fwiw, phpunit dep worked for me on php 7.4 just now but I've removed it as requested.

[hexmode]

Given the failures on php 7.0, the options are dropping support 7.0 (my preference, since it is EOL) or dropping the type hints.

[DeepDiver1975]

php7.0 compliant version #427