Remove version from composer and update changelog.md (#242)

# Summary <!-- Required -->

Removes package version from composer.json. This should make packagist
point to the git tags. Also updated the changelog.md to include changes
from 1.0.1.

### Closes: #241 

## Contributor checklist <!-- Required -->

<!--- Go over all the following points, and put an `x` in all the boxes
that apply. -->
<!--- If you are unsure about any of these, please ask for
clarification. We are here to help! -->

- [x] I agree to follow this project's [**Code of
Conduct**](https://github.com/10up/.github/blob/trunk/CODE_OF_CONDUCT.md).
- [x] I have updated the documentation accordingly 
- [x] I have added tests to cover changes introduced by this pull
request
- [x] All new and existing tests pass

## Testing <!-- Required -->

- [x] All tests pass in CI 

### Reviewer checklist <!-- Required -->

<!-- The following checklist is for the reviewer: add any steps that may
be relevant while reviewing this pull request -->

- [x] Code changes review
- [x] Documentation changes review
- [x] Unit tests pass
- [x] Static analysis passes

Update CHANGELOG and composer version for v1.0.0 release (#231)

Update credits (#176)

Update 0.4.2

* Update issue templates and contributing guidelines.
* Fix some spacing and documentation from PR #136
* assertActionsCalled and assertHooksAdded now actually assert. Added assertFiltersCalled Added tests for these functions.  Changed risky tests

Fixes #136

Merge 0.4.1. Fixes #133

Merge pull request #129 from 10up/compat-pr

PHPUnit 7.x Compatibility Fixes

Fixes #117

Merging 0.3.0

Bump for v0.2.0

Merge pull request #23 from stevegrunwell/better-docs

Better docs

phpDocumentor output