Add checkLonely to tests

Signed-off-by: Eli Skeggs <skeggse@gmail.com>
Fix typo

Signed-off-by: Eli Skeggs <skeggse@gmail.com>
Add callback typecheck

Signed-off-by: Eli Skeggs <skeggse@gmail.com>
Add nicely.sequentially

Aliased as nicely.sequence for ease of use

Signed-off-by: Eli Skeggs <skeggse@gmail.com>
Add nicely.sequentially to README

Signed-off-by: Eli Skeggs <skeggse@gmail.com>
[0.0.4] Version bump

Signed-off-by: Eli Skeggs <skeggse@gmail.com>