Changes in version 1.21.1

- add "max_freq" method for mean_mode so that in each interval, value corresponded to
  the maximal frequency is selected.

-----------------------------

Changes in version 1.13.3

- set `interpolate = FALSE` in `grid.raster()`
- improved `hc_map()`

-----------------------------

Changes in version 1.13.2

- fixed warnings in Rd files

-----------------------------

Changes in version 1.13.1

- update with new definition of legends

----------------------------

Changes in version 1.11.1

- move IRanges and GenomicRanges to imports field in DESCRIPTION

Changes in verison 1.5.2
----------------------------

- `hc_map` supports to add labels under pixel mode 


Changes in verison 1.1.6
----------------------------

- change format of NEWS

Changes in verison 1.1.5
----------------------------

- use new version of testthat

Changes in version 1.1.4
----------------------------

- add citation

Changes in version 1.1.3
----------------------------

- revised vignette

Changes in version 1.1.2
----------------------------

- add examples in vignette
- add `hc_polygon()`
- `hc_map()`: support borders
- `HilbertCurve()`: start position can be selected, also the orientation
  of the first segment can be selected


Changes in version 1.1.1
----------------------------

- add functions specific for genomic data visualization


Changes in version 0.99.3
----------------------------

- transparency is also averaged


Changes in version 0.99.2
----------------------------

- jump to top viewport for each low-level functions


Changes in version 0.99.1
----------------------------

- add dependency to base packages

Changes in version 0.99.0
----------------------------

- new release

