Trailing comments are not preserved

[glyn]

The README states:

Comments and the order of keys are preserved.

However, comments at the end of a properties file are not preserved. See https://github.com/magiconair/properties/pull/44 for a failing test.

Note that the example properties file shown in wikipedia has a trailing comment, so trailing comments are certainly valid.

A special, degenerate case of trailing comments is a properties file consisting of comments alone.