Enforces the use of type-safe equality operators `===` and `!==` instead of the
more error prone `==` and `!=` operators.

`===` and `!==` ensure the comparators are of the same type as well as the same
value. On the other hand `==` and `!=` do type coercion before value checking
which can lead to unexpected results. For example `5 == "5"` is `true`, while
`5 === "5"` is `false`.

### Invalid:

```typescript
if (a == 5) {}
if ("hello world" != input) {}
```

### Valid:

```typescript
if (a === 5) {}
if ("hello world" !== input) {}
```