Update stable version download in getting-started.md

Updated download link to stable version 1.12.17.

Author: dpolivaev

src/docs/getting-started/getting-started.md

@@ -5,7 +5,7 @@
 [![Download Freeplane](../images/Download.png ':size=71x67')](https://sourceforge.net/projects/freeplane/ ':target=_blank')
 
 <big>**[Download Freeplane now!](https://github.com/freeplane/freeplane/releases ':target=_blank')** </big>\
-(this downloads the stable version 1.12.16)\
+(this downloads the stable version 1.12.17)\
 [change log](https://www.freeplane.org/info/history/history_en.txt) \
 
 → [Find out](Distributions.md) which distribution better fits your requirements.