Updated dependencies: jest, npm-package-json-lint and `read-pkg-u…

…p` (#8596)

## Description

This PR updates `npm-package-json-lint` to the latest version and adds newly introduced rules. Props to @tclindner for making it possible:

> Hey! I just released v3.3.0 of npm-package-json-lint with a new description-format rule. It has two options:
> 
> requireCapitalFirstLetter - Throws an error if the first character in the description isn't capitalized.
> requireEndingPeriod - Throws an error if the description doesn't end with a period.
> Hopefully this works well for your team!

With this change, we can integrate new linting rule which will ensure that `description` inside `package.json` file will have proper formatting.

I took advantage of the fact that we are changing deps and bumped also `jest` which had also minor release.

I also downgraded `read-pkg-up` to avoid having it installed locally in the package. Instead, we can use the older version which is used with other packages. It doesn't break anything and keeps our setup simpler.

## How has this been tested?
`npm test` should cover all tools.

package.json

@@ -120,6 +120,13 @@
 	"npmPackageJsonLintConfig": {
 		"extends": "@wordpress/npm-package-json-lint-config",
 		"rules": {
+			"description-format": [
+				"error",
+				{
+					"requireCapitalFirstLetter": true,
+					"requireEndingPeriod": true
+				}
+			],
 			"require-publishConfig": "error",
 			"valid-values-author": [
 				"error",

packages/scripts/CHANGELOG.md

@@ -1,3 +1,7 @@
+## 2.1.0 (Unreleased)
+
+- Updated dependencies: `jest`, `npm-package-json-lint` and `read-pkg-up`
+
 ## 2.0.0 (2018-07-12)
 
 - Breaking: Updated code to work with Babel 7 ([#7832](https://github.com/WordPress/gutenberg/pull/7832))

packages/scripts/package.json

@@ -35,9 +35,9 @@
 		"@wordpress/jest-preset-default": "file:../jest-preset-default",
 		"@wordpress/npm-package-json-lint-config": "file:../npm-package-json-lint-config",
 		"cross-spawn": "^5.1.0",
-		"jest": "^23.3.0",
-		"npm-package-json-lint": "^3.0.1",
-		"read-pkg-up": "^4.0.0",
+		"jest": "^23.4.2",
+		"npm-package-json-lint": "^3.3.0",
+		"read-pkg-up": "^1.0.1",
 		"resolve-bin": "^0.4.0"
 	},
 	"publishConfig": {