Updated changelog
Updated changelog

Included missing entries:

* random numbers
* new `wavefd` code
* tesseroid speedup

eusoubrasileiro/fatiando_seismic,eusoubrasileiro/fatiando,rafaelmds/fatiando,drandykass/fatiando,victortxa/fatiando,fatiando/fatiando,fatiando/fatiando,cmeessen/fatiando,rafaelmds/fatiando,santis19/fatiando,victortxa/fatiando,mtb-za/fatiando,eusoubrasileiro/fatiando_seismic,eusoubrasileiro/fatiando,cmeessen/fatiando,drandykass/fatiando,mtb-za/fatiando,santis19/fatiando,eusoubrasileiro/fatiando