update readme

README.md

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 ## Description
 
-Basic information from a tbl_friendlyts data.frame.
-    - Mean, standard-deviation, IQR. min, max,... on different groups: year, month, weekday, hour, minute, second.
-    - Timeseries of basic information.
-    - L-moments.
-    - Plots.
+Basic information from a tbl_friendlyts data.frame:
+
+- Mean, standard-deviation, IQR. min, max,... on different groups: year, month, weekday, hour, minute, second.
+- Timeseries of basic information.
+- L-moments.
+- Plots.
 
 
 ## Installation