bundle update
ex. 1 done
ex. 2 done (pagination test only for profile page)
ex. 3 done
fix: use current_user method in comparison in current_user? method
because somehow @current_user is nil on users#show page
ex. 4 done
ex. 5 done
forgoten: app/views/shared/_delete_link.html.erb
modify: redirect after micropost#destroy to user_path(current_user)
ex. 6 done
ex. 7 done