add missing 2.10.2 release notes file
add missing 2.10.2 release notes file

wagtail/wagtail,gasman/wagtail,jnns/wagtail,takeflight/wagtail,mixxorz/wagtail,FlipperPA/wagtail,takeflight/wagtail,FlipperPA/wagtail,kaedroho/wagtail,torchbox/wagtail,mixxorz/wagtail,thenewguy/wagtail,thenewguy/wagtail,thenewguy/wagtail,jnns/wagtail,thenewguy/wagtail,FlipperPA/wagtail,FlipperPA/wagtail,zerolab/wagtail,wagtail/wagtail,gasman/wagtail,gasman/wagtail,rsalmaso/wagtail,torchbox/wagtail,mixxorz/wagtail,rsalmaso/wagtail,zerolab/wagtail,zerolab/wagtail,rsalmaso/wagtail,jnns/wagtail,torchbox/wagtail,mixxorz/wagtail,kaedroho/wagtail,takeflight/wagtail,rsalmaso/wagtail,kaedroho/wagtail,wagtail/wagtail,takeflight/wagtail,kaedroho/wagtail,zerolab/wagtail,jnns/wagtail,kaedroho/wagtail,mixxorz/wagtail,gasman/wagtail,gasman/wagtail,wagtail/wagtail,wagtail/wagtail,torchbox/wagtail,thenewguy/wagtail,rsalmaso/wagtail,zerolab/wagtail