Add support for char column type in TableRowValueAssert#isEqualTo

[men-devnat-grenoble]

As a tester I want to be able to check character value on char type column.
At the moment char I have to use the isEqualTo(String) signature to perform this test

assertThat(table).row(3).value("code").isEqualTo('A')

Thanks for your job!

[regis1512]

Thanks for your suggestion.
It will be a good thing.
I will try to add it in the next version.