message: test(dtslint): add min
diff: import { of } from 'rxjs';
  -import { max } from 'rxjs/operators';
  +import { min } from 'rxjs/operators';
  it('should infer correctly', () => {
  - const a = of(1, 2, 3).pipe(max()); // $ExpectType Observable<number>
  - const b = of('abc', 'bcd', 'def').pipe(max()); // $ExpectType Observable<string>
  + const a = of(1, 2, 3).pipe(min()); // $ExpectType Observable<number>
  + const b = of('abc', 'bcd', 'def').pipe(min()); // $ExpectType Observable<string>
  });
  it('should except empty comparer', () => {
  - const a = of(1, 2, 3).pipe(max()); // $ExpectType Observable<number>
  + const a = of(1, 2, 3).pipe(min()); // $ExpectType Observable<number>
  });
  it('should enforce comparer types', () => {
  - const a = of(1, 2, 3).pipe(max((a: number, b: number) => a - b)); // $ExpectType Observable<number>
  - const b = of(1, 2, 3).pipe(max((a: number, b: string) => 0)); // $ExpectError
  - const c = of(1, 2, 3).pipe(max((a: string, b: number) => 0)); // $ExpectError
  + const a = of(1, 2, 3).pipe(min((a: number, b: number) => a - b)); // $ExpectType Observable<number>
  + const b = of(1, 2, 3).pipe(min((a: number, b: string) => 0)); // $ExpectError
  + const c = of(1, 2, 3).pipe(min((a: string, b: number) => 0)); // $ExpectError
  });
  