fix URLs in CHANGELOG

Author: tpapp

CHANGELOG.md

@@ -1,9 +1,9 @@
 # 0.8.0
 
-- add `ValueGradientBuffer` for pre-allocated gradient storage (#34)
-- remove taped ReverseDiff-based AD (#36)
-- remove support for rejection-based unwindind of the stack (#39)
-- add support for Zygote-based AD (#40, experimental)
+- add `ValueGradientBuffer` for pre-allocated gradient storage ([#34](https://github.com/tpapp/LogDensityProblems.jl/pull/34))
+- remove taped ReverseDiff-based AD ([#36](https://github.com/tpapp/LogDensityProblems.jl/pull/36))
+- remove support for rejection-based unwindind of the stack ([#39](https://github.com/tpapp/LogDensityProblems.jl/pull/39))
+- add support for Zygote-based AD ([#40](https://github.com/tpapp/LogDensityProblems.jl/pull/40), experimental)
 
 # 0.7.0 and prior