Change Booktype version in VERSION.txt to 1.5.2
Change Booktype version in VERSION.txt to 1.5.2

aerkalov/Booktype,danielhjames/Booktype,olegpshenichniy/Booktype,MiczFlor/Booktype,eos87/Booktype,sourcefabric/Booktype,btat/Booktype,ride90/Booktype,okffi/booktype,okffi/booktype,danielhjames/Booktype,sourcefabric/Booktype,kronoscode/Booktype,ride90/Booktype,sourcefabric/Booktype,olegpshenichniy/Booktype,danielhjames/Booktype,eos87/Booktype,rob-hills/Booktype,eos87/Booktype,eos87/Booktype,kronoscode/Booktype,olegpshenichniy/Booktype,kronoscode/Booktype,btat/Booktype,btat/Booktype,kronoscode/Booktype,ride90/Booktype,rob-hills/Booktype,kronoscode/Booktype,MiczFlor/Booktype,MiczFlor/Booktype,aerkalov/Booktype,olegpshenichniy/Booktype,okffi/booktype,olegpshenichniy/Booktype,rob-hills/Booktype,okffi/booktype,MiczFlor/Booktype,danielhjames/Booktype,aerkalov/Booktype,ride90/Booktype,ride90/Booktype,okffi/booktype,eos87/Booktype,sourcefabric/Booktype,btat/Booktype,MiczFlor/Booktype,sourcefabric/Booktype,rob-hills/Booktype,danielhjames/Booktype