ThreadLocalScopeManager activeSpan method broken

[sebukoleth]

@Override public Span activeSpan() { ThreadLocalScope scope = tlsScope.get(); return scope == null ? null : scope.span(); }

But Scope.span() method was deprecated in 0.32 and removed in 0.33. So if we try to use, for example, opentracing-concurrent 0.4.0, NoSuchMethodError will be raised.