Release sircovid 0.6.2

Merge pull request #140 from mrc-ide/calc_test_prob

Introduce test_prob_pos, tweak sero calculation and wire in pillar 2 over 25

Release sircovid 0.6.1

Merge pull request #138 from mrc-ide/ll_react

Add REACT to log-likelihood

Release sircovid 0.6.0

Merge pull request #135 from mrc-ide/sircovid2-to-sircovid

Rename sircovid2 to sircovid

Release sircovid2 0.5.23

v0.5.23

Merge remote-tracking branch 'sircovid2/master'