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Add my impression
Merge branch 'work' of github.com:hiramatsutaku/first-pr into hiramatsutaku-work

Conflicts:
	index.html
Merge branch 'hiramatsutaku-work' into gh-pages
Merge branch 'work' of github.com:kung-fu/first-pr into kung-fu-work

Conflicts:
	index.html
Merge branch 'kung-fu-work' into gh-pages
Merge branch 'work' of github.com:doi-t/first-pr into doi-t-work
Merge branch 'doi-t-work' into gh-pages