Update .gitignore
Update .gitignore

Former-commit-id: 1228046417fad7bb636f7934a5c56cc383ff9e91
jgraph/draw.io,jgraph/drawio,jgraph/drawio,jgraph/draw.io,jgraph/draw.io,jgraph/draw.io,jgraph/drawio,jgraph/draw.io