0.8.28.2 - version increment (cloud-custodian#2264)

minor version increment - 0.8.28.1 (cloud-custodian#2108)

update version - 0.8.28.0 (cloud-custodian#2016)

minor version increase (0.8.27.3) (cloud-custodian#1938)

version increment (0.8.27.2) (cloud-custodian#1889)

version increment

docs - set-instance-profile fix the example policy (cloud-custodian#1668

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minor version increment 0.8.26.1 (cloud-custodian#1603)

version increment - 0.8.26.0 (cloud-custodian#1552)

tools/c7n_mailer - add back c7n_mailer.replay (cloud-custodian#1514)