changelog: mention test improvements
## v1.0.2
-Released 2020-05-25
+Released 2020-05-28
- Relaxed version constraint for aeson, allowing `aeson-1.5.*`.
+- Update CI tests to check with GHC versions 8.0 through 8.10.
+ Compilation with GHC 7.10 is no longer tested.
+
+- Bump to stackage LTS-14.
+
## v1.0.1
Released 2020-04-03
