Update readme

State right up-front that this package can be used to parse week dates and ordinal dates
pineapplemachine · May 20, 2018 · c9b949c · c9b949c
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@@ -7,6 +7,8 @@ It supports most of the combined features of
 [Ruby](https://apidock.com/ruby/DateTime/strftime),
 and [GNU C](https://www.gnu.org/software/libc/manual/html_node/Formatting-Calendar-Time.html)
 strftime and strptime functions.
+With strtime is is possible to write and parse calendar dates (e.g. `%Y-%m-%d`),
+week dates (e.g. `%G-W%V-%u`), and ordinal dates (e.g. `%Y-%j`).
 
 ## Installation