Update changelog

Merge pull request DaveGamble#355 from DaveGamble/release-1.7.12

Release 1.7.12

Merge pull request DaveGamble#344 from DaveGamble/release-1.7.11

Release 1.7.11

Release Version 1.7.10

Release Version 1.7.9

Release version 1.7.8

Release cJSON v1.7.7

Release version 1.7.6

Release version 1.7.5

Merge pull request DaveGamble#249 from DaveGamble/fix-add-item

Release 1.7.4