[meta] add safe-publish-latest; use prepublishOnly script for npm 7+

package.json

@@ -14,6 +14,8 @@
 	"scripts": {
 		"version": "auto-changelog && git add CHANGELOG.md",
 		"postversion": "auto-changelog && git add CHANGELOG.md && git commit --no-edit --amend && git tag -f \"v$(node -e \"console.log(require('./package.json').version)\")\"",
+		"prepublishOnly": "safe-publish-latest",
+		"prepublish": "not-in-publish || npm run prepublishOnly",
 		"lint": "eslint .",
 		"pretest": "npm run lint",
 		"tests-only": "nyc tape 'test/**/*.js'",
@@ -48,6 +50,7 @@
 		"for-each": "^0.3.3",
 		"nyc": "^10.3.2",
 		"object-inspect": "^1.9.0",
+		"safe-publish-latest": "^1.1.4",
 		"tape": "^5.1.1"
 	},
 	"dependencies": {