CHANGES IN VERSION 1.1.1

* print message if input chromosome names are without 'chr'
* call `start()` and `end()` explictely with `GenomicRanges::`
* unit of x-axis is correct now

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CHANGES IN VERSION 0.99.3

* modified infinite loop when making asistant ticks

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CHANGES IN VERSION 0.99.2

* change `gtrellis_info` to `gtrellis_show_index`

