Immunity estimate graph shows odd saw pattern in early 2021.

[klenwell]

See this screenshot:

This showed up after this issue was fixed: https://github.com/klenwell/covid-19/issues/55

I added a TODO comment to the code indicating what I believe to be the source of the issue:

• https://github.com/klenwell/covid-19/commit/163bd1e937e413a70d6bd2b3bd9b93e31b6c9661

[klenwell]

Solved

Problem

Immunity estimates showed jitters around second shot due to way immunity was being computed.

Solution

Updated full vaccine (second shot) computation so that it adjusted ramp up to account for first shot (PR #58). Compare graphs below:

After

Before