Add restrict-plus-operands rule

https://github.com/typescript-eslint/typescript-eslint/blob/master/packages/eslint-plugin/docs/rules/restrict-plus-operands.md

Author: sindresorhus

index.js

@@ -152,6 +152,7 @@ module.exports = {
 		'@typescript-eslint/no-var-requires': 'error',
 		'@typescript-eslint/prefer-interface': 'error',
 		'@typescript-eslint/prefer-namespace-keyword': 'error',
+		'@typescript-eslint/restrict-plus-operands': 'error',
 		'@typescript-eslint/type-annotation-spacing': 'error'
 	}
 };

package.json

@@ -42,14 +42,14 @@
 		"simple"
 	],
 	"devDependencies": {
-		"@typescript-eslint/eslint-plugin": "^1.0.0",
+		"@typescript-eslint/eslint-plugin": "^1.1.0",
 		"ava": "^1.1.0",
 		"eslint": "^5.12.1",
 		"temp-write": "^3.4.0",
 		"typescript": "^3.2.4"
 	},
 	"peerDependencies": {
-		"@typescript-eslint/eslint-plugin": ">=1.0.0",
+		"@typescript-eslint/eslint-plugin": ">=1.1.0",
 		"eslint": ">=5.12.1",
 		"typescript": ">=3.2.4"
 	}