#10 bypass example

for https://github.com/tokuhirom/Test-Ika/issues/10

can write:

```perl
before_each {
    my ($example. $group) = @_;
    # ...
};

after_each {
    my ($example, $group) = @_;

    if ($example->skip) {
        print "skipped";
    }
    elsif ($example->result) {
        print "succeeded";
    }
    else {
        print "failed";
    }
};
```