Add typescript as a dependency

To fix installation with npm@6 which doesn’t install peer dependencies like npm@7.

Author: sindresorhus

package.json

@@ -43,13 +43,15 @@
 		"hint",
 		"simple"
 	],
+	"dependencies": {
+		"typescript": ">=4"
+	},
 	"devDependencies": {
 		"@typescript-eslint/eslint-plugin": "^4.21.0",
 		"@typescript-eslint/parser": "^4.22.1",
 		"ava": "^2.4.0",
 		"eslint": "^7.8.1",
-		"temp-write": "^4.0.0",
-		"typescript": "^4.1.3"
+		"temp-write": "^4.0.0"
 	},
 	"peerDependencies": {
 		"@typescript-eslint/eslint-plugin": ">=4.22.1",