Write cover letter

NEWS.md

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 ## Major changes
 
 - Quantile approximation: `hstats()` now has the option `approx = FALSE`. Set to `TRUE` to replace values of dense numeric columns by `grid_size = 50` quantile midpoints. This will bring a massive speed-up for one-way calculations. Use this option when one-way calculations are slow, or when you want to increase `n_max`.
-- `hstats()`: `n_max` has been increased from 300 to 500 rows. This will make estimates of H statistics more stable at the price of longer run time. Reduce to 300 for the old behaviour.
+- `hstats()`: `n_max` has been increased from 300 to 500 rows. This will make estimates of H-statistics more stable at the price of longer run time. Reduce to 300 for the old behaviour.
 - `hstats()`: Three-way interactions are not anymore calculated by default. Set `threeway_m` to 5 for the old behaviour.
 - Revised plots: The colors and color palettes have changed and can now also be controlled via global options. For instance, to change the fill color of all bars, set `options(hstats.fill = new value)`. Value labels are more clear, and there are more options. Varying color/fill scales now use viridis (inferno). This can be modified on the fly or via `options(hstats.viridis_args = list(...))`.
 - "hstats_matrix" object: All statistics functions, e.g., `h2_pairwise()` or `perm_importance()`, now return a "hstats_matrix". The values are stored in `$M` and can be plotted via `plot()`. Other methods include: `dimnames()`, `rownames()`, `colnames()`, `dim()`, `nrow()`, `ncol()`, `head()`, `tail()`, and subsetting like a normal matrix. This allows, e.g, to select and plot only one column of the results.

cran-comments.md

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-# hstats 0.3.0
+# hstats 1.0.0
 
 Dear CRAN team
 
-{hstats} is now one step away from stable version 1.0.0.
+{hstats} has reached a state that can be called 1.0.0, hurray!
 
-Michael
+THe main improvements are:
 
-## Local checks: OK
+- Different API improvements.
+- Option for fast approximate values.
+- Plots now look quite nice.
+- Better defaults.
+
+## Local checks: Harmless note
+
+checking HTML version of manual ... NOTE
+  Skipping checking HTML validation: no command 'tidy' found
 
-## Rhub has its typical notes
+## Rhub with typical notes
 
 * checking HTML version of manual ... NOTE
 Skipping checking HTML validation: no command 'tidy' found
 Skipping checking math rendering: package 'V8' unavailable
 
-## Winbuilder: OK
+## Winbuilder
 
+Status: OK