Upgraded version of yasson dependency to 1.0.3. (#738)
Upgraded version of yasson dependency to 1.0.3. (#738)

fixes TweetWallFX/TweetwallFX#737
mklaehn/TweetwallFX,fvogler/TweetwallFX,reinhapa/TweetwallFX,TweetWallFX/TweetwallFX,svenreimers/TweetwallFX,jmichelberger/TweetwallFX