Update syntax keyword

[hokorobi]

• Update the syntax file from the "java -jar plantuml.jar -language" results.
• "together" is now output to 'keyword' so moved to 'plantumlKeyword'.

The “Skinparam keyword” output by “java -jar plantuml.jar -language” seems to be much less.

[aklt]

Cool, thank you for this also!

Took me a little while to look at it, sorry :-)

[hokorobi]

Not at all. Thank you!