Update test code to support quickcheck >= 1

[tenzap]

I'm packaging file-rotate for Debian.
In Debian we run the test suite of the crates.
However we currently support quickcheck >= 1 only and your crate uses version 0.9
I tried running the tests with quickcheck but they are never ending.
Would you update your crate so that the test suite can fully run with quickcheck 1?
For now I'm ignoring the 2 tests that use quickcheck:

• fn arbitrary_bytes(count: usize) {
• fn arbitrary_lines(count: usize) {