Improve changelog

NEWS.md

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 ## Important and breaking changes
 
-- `min_uc_size`, `uc_size1` and `uc_size2` arguments to `rainette` and `rainette2` have been renamed to `min_segment_size`, `min_segment_size1` and `min_segment_size2`
-- The default value of `min_segment_size` in `rainette` is now 0, which means that no merging is done between segments by default. Results could be different from previous versions when `min_uc_size` was not specified.
-- Merging of segments based on `min_segment_size` was not handled correctly in the previous versions regarding the segment sources : segments from different documents could be merged together. This should now be fixed.
+- `min_uc_size`, `uc_size1` and `uc_size2` arguments to `rainette` and `rainette2` have been renamed to `min_segment_size`, `min_segment_size1` and `min_segment_size2`.
+- The default value of `min_segment_size` in `rainette` is now `0`, which means that no merging is done between segments by default. Results could then be different from previous package versions when `min_uc_size` was not specified.
+- Important bugfix : merging of segments based on `min_segment_size` was not handled correctly in the previous versions regarding the segment sources, as segments from different documents could be merged together. This should now be fixed.
 
 ## New features
 
 - A new graphical interface to browse cluster documents has been added to `rainette_explor` and `rainette2_explor`.
 - New function `clusters_by_doc_table` which gives the number of segments of each cluster for each document.
 - New function `docs_by_cluster_table` which gives, for each cluster, the number of documents with at least one segment in this cluster.
-- `split_segments` is now about 4 times faster.
+- `split_segments` should now be about 4 times faster.
 - Terms frequencies and documents proportions statistics have been added to the explor interfaces.
 
 ## Other
 
 - When `rainette` is called with `min_segment_size` > 0, a `doc_id` argument must be given which is the name of a `dtm` docvar identifying the segments source. If the corpus has been produced by `split_segments`, the added `segment_source` docvar is used by default.
-- Color palettes for clusters changed to "Tableau 10"
-- Negative keyness values are not shown by default anymore in `rainette_explor`, `rainette2_explor`, `rainette_plot` and `rainette2_plot`
-- Wordcloud plots have been removed from explor interfaces
-- Add warning when `min_split_members` < 3
-- Launch `rainette2_explor` if `rainette_explor` is called on a `rainette2` results object
+- Color palette for clusters changed to "Tableau 10".
+- Negative keyness values are not shown by default anymore in `rainette_explor`, `rainette2_explor`, `rainette_plot` and `rainette2_plot`.
+- Wordcloud plots have been removed from explor interfaces.
+- A warning is displayed when `min_split_members` < 3.
+- If `rainette_explor` is called on a `rainette2` results object, `rainette2_explor` is launched automatically.
 
 # rainette 0.1.3