chore(deps): update dependency psalm/plugin-phpunit to ^0.18.0 (#31)

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This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
|
[psalm/plugin-phpunit](https://togithub.com/psalm/psalm-plugin-phpunit)
| require-dev | minor | `^0.17.0` -> `^0.18.0` |

---

### Release Notes

<details>
<summary>psalm/psalm-plugin-phpunit</summary>

###
[`v0.18.4`](https://togithub.com/psalm/psalm-plugin-phpunit/releases/tag/0.18.4)

[Compare
Source](https://togithub.com/psalm/psalm-plugin-phpunit/compare/0.18.3...0.18.4)

#### What's Changed

- Allow Psalm 5.0 by [@&#8203;ddeboer](https://togithub.com/ddeboer) in
[psalm/psalm-plugin-phpunit#127

#### New Contributors

- [@&#8203;ddeboer](https://togithub.com/ddeboer) made their first
contribution in
[psalm/psalm-plugin-phpunit#127

**Full Changelog**:
psalm/psalm-plugin-phpunit@0.18.3...0.18.4

###
[`v0.18.3`](https://togithub.com/psalm/psalm-plugin-phpunit/releases/tag/0.18.3):
Fix typo

[Compare
Source](https://togithub.com/psalm/psalm-plugin-phpunit/compare/0.18.2...0.18.3)

#### What's Changed

- Fix typo, it turns out $\_ is used later on as a ref parameter by
[@&#8203;danog](https://togithub.com/danog) in
[psalm/psalm-plugin-phpunit#126

**Full Changelog**:
psalm/psalm-plugin-phpunit@0.18.2...0.18.3

###
[`v0.18.2`](https://togithub.com/psalm/psalm-plugin-phpunit/releases/tag/0.18.2):
Fix version detection

[Compare
Source](https://togithub.com/psalm/psalm-plugin-phpunit/compare/0.18.1...0.18.2)

#### What's Changed

- Dumb version detection by [@&#8203;danog](https://togithub.com/danog)
in
[psalm/psalm-plugin-phpunit#125

**Full Changelog**:
psalm/psalm-plugin-phpunit@0.18.1...0.18.2

###
[`v0.18.1`](https://togithub.com/psalm/psalm-plugin-phpunit/releases/tag/0.18.1):
Allow using on 5.x-dev

[Compare
Source](https://togithub.com/psalm/psalm-plugin-phpunit/compare/0.18.0...0.18.1)

###
[`v0.18.0`](https://togithub.com/psalm/psalm-plugin-phpunit/releases/tag/0.18.0):
Compatibility release

[Compare
Source](https://togithub.com/psalm/psalm-plugin-phpunit/compare/0.17.0...0.18.0)

#### What's Changed

- \[composer.json] allow Psalm 5 beta by
[@&#8203;someniatko](https://togithub.com/someniatko) in
[psalm/psalm-plugin-phpunit#122
- Immutable refactoring by [@&#8203;danog](https://togithub.com/danog)
in
[psalm/psalm-plugin-phpunit#123

#### New Contributors

- [@&#8203;someniatko](https://togithub.com/someniatko) made their first
contribution in
[psalm/psalm-plugin-phpunit#122
- [@&#8203;danog](https://togithub.com/danog) made their first
contribution in
[psalm/psalm-plugin-phpunit#123

**Full Changelog**:
psalm/psalm-plugin-phpunit@0.17.0...0.18.0

</details>

---

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composer.json

@@ -34,7 +34,7 @@
         "phpstan/phpstan-mockery": "^1.0",
         "phpstan/phpstan-phpunit": "^1.1",
         "psalm/plugin-mockery": "^0.9.1",
-        "psalm/plugin-phpunit": "^0.17.0",
+        "psalm/plugin-phpunit": "^0.18.0",
         "ramsey/coding-standard": "^2.0.3",
         "ramsey/composer-repl": "^1.4",
         "ramsey/conventional-commits": "^1.3",