Fix bug in HistoryHinter when ctx.history_index() is 0
#186
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Running the example without a `history.txt` file on the current master lead to the following error: ``` thread 'main' panicked at 'attempt to subtract with overflow', src\hint.rs:26:13 note: Run with `RUST_BACKTRACE=1` environment variable to display a backtrace. error: process didn't exit successfully: `target\debug\examples\example.exe` (exit code: 101) ```
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Running the example without a
history.txtfile on the current master lead to the following error: