news.md in grntest-1.5.3

- old
+ new

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 # News
 
+## 1.5.3: 2021-08-14
+
+### Improvements
+
+  * `generate-series`: Added support for multi-byte characters.
+
 ## 1.5.2: 2021-08-05
 
 ### Improvements
 
   * `stdio`: Improved may be slow command processing.