"restrict-plus-operands" doesn't understand BigInt

[bowenni]

Bug Report

• TSLint version: 5.16.0
• TypeScript version: 3.4.0
• Running TSLint via: CLI

TypeScript code being linted

BigInt(1) + BigInt(2);

with tslint.json configuration:

{
  "rules": {
    "restrict-plus-operands": true
  }
}

Actual behavior

Operands of '+' operation must either be both strings or both numbers, but found bigint + bigint

Expected behavior

No errors.