Update CHANGELOG.md
Update CHANGELOG.md

Specify ionicons install version, see https://github.com/driftyco/ionic/issues/5221.
joshesp/ionic,AbraaoAlves/ionic,cambronjay/ionic,jhlee8804/ionic,driftyco/ionic,dennybiasiolli/ionic,driftyco/ionic,jarrodkoch/ionic,brianespinosa/ionic2-sass,manucorporat/ionic,TillaTheHun0/ionic,AbraaoAlves/ionic,jhlee8804/ionic,alan-agius4/ionic,jarrodkoch/ionic,manucorporat/ionic,AbraaoAlves/ionic,joshesp/ionic,jhlee8804/ionic,jhlee8804/ionic,alan-agius4/ionic,dennybiasiolli/ionic,joshesp/ionic,TillaTheHun0/ionic,janglednerves/ionic,dennybiasiolli/ionic,janglednerves/ionic,driftyco/ionic,jarrodkoch/ionic,TillaTheHun0/ionic,janglednerves/ionic,jarrodkoch/ionic,alan-agius4/ionic,alan-agius4/ionic,AbraaoAlves/ionic,dennybiasiolli/ionic,janglednerves/ionic,janglednerves/ionic,manucorporat/ionic,AbraaoAlves/ionic,driftyco/ionic,dennybiasiolli/ionic,jarrodkoch/ionic,cambronjay/ionic,TillaTheHun0/ionic,alan-agius4/ionic,joshesp/ionic,cambronjay/ionic,manucorporat/ionic,cambronjay/ionic,manucorporat/ionic,alan-agius4/ionic,cambronjay/ionic,jhlee8804/ionic,driftyco/ionic