update the changelog

Author: tpapp

CHANGELOG.md

@@ -9,81 +9,89 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ### Added
 
+- add a `merge` method for `NamedTuple` transformations [#150](https://github.com/tpapp/TransformVariables.jl/pull/150)
+
+### Fixed
+
+- Cleaned up inverse eltype calculations [#149](https://github.com/tpapp/TransformVariables.jl/pull/149)
+
+### Security
+
+
+## 0.8.18
+
+### Added
+
 - `getindex`, `getproperty`, `length`, and support for [Accessors.jl](https://github.com/JuliaObjects/Accessors.jl) API for tuple and named tuple transformations
 
-### Changed
-### Deprecated
-### Removed
 ### Fixed
 
 - made nicer error messages for mismatching `NamedTuple`s in `inverse`
 - `inverse_eltype` did not reshuffle mismatching `NamedTuple`s, fixed
 
-### Security
-
 ## Old changelogs (archive)
 
-# 0.8.17
+### 0.8.17
 
 **Changelogs were not kept** between 0.3.11 and this version. PRs reconstructing them are welcome.
 
-# 0.3.11
+### 0.3.11
 
 - remove dependency on MacroTools for abstract dispatch workaround, but require Julia 1.3
 - deprecate t(x) interface
 
-# 0.3.10
+### 0.3.10
 
 - compat bump
 
-# 0.3.9
+### 0.3.9
 
 - follow up changes in for LogDensityProblems
 
-# 0.3.8
+### 0.3.8
 
 - add UnitSimplex ([#56], thanks @scheidan)
 
-# 0.3.7
+### 0.3.7
 
 - fix some tuple index bugs (cf [#58])
 
-# 0.3.6
+### 0.3.6
 
 - Pretty print scalar transforms ([#54], thanks @tkf)
 
-# 0.3.5
+### 0.3.5
 
 - use new LogDensityProblems interface
 
 - rewrite internals to work better with AD (especially Zygote)
 
 - fix broadcasting (`Ref(transformation)` no longer necessary)
 
-# 0.3.4
+### 0.3.4
 
 - make `inverse(::ArrayTransform)` accept `AbstractArray`
 
-# 0.3.3
+### 0.3.3
 
 - Add ASCII aliases for common scalar transforms
 
-# 0.3.2
+### 0.3.2
 
 - Check length of inputs for CorrCholeskyFactor
 - minor doc updates for CorrCholeskyFactor
 
-# 0.3.1
+### 0.3.1
 
 - Catch wrong size UnitVector inputs (thanks @cscherrer)
 
-# 0.3.0
+### 0.3.0
 
 - Type stability and inference fixes
 - Allow empty Tuple and NamedTuple aggregators
 - Fix element type calculations, especially for AD via Flux
 - Argument checks for inverse of ScaledShiftedLogistic (thanks @andreasnoack)
 
-# 0.2.0
+### 0.2.0
 
 Sorry, no changelog before this.