update png's (sd5, sd8, sd9)
Merge branch 'master' of https://github.com/omkelderman/YouSync

Conflicts:
	Documenten/Ontwerpen/UML/Sequence Diagrams/PNG/SD5 - Chatbericht ontvangen - Host.png
	Documenten/Ontwerpen/UML/Sequence Diagrams/PNG/SD5 - Chatbericht versturen - Client.png
	Documenten/Ontwerpen/UML/Sequence Diagrams/PNG/SD9 - Naam kiezen.png