Use compose-spec parser

Signed-off-by: CrazyMax <crazy-max@users.noreply.github.com>

vendor/github.com/mitchellh/mapstructure/CHANGELOG.md

@@ -1,3 +1,55 @@
+## unreleased
+
+* Fix regression where `*time.Time` value would be set to empty and not be sent 
+  to decode hooks properly [GH-232]
+
+## 1.4.0
+
+* A new decode hook type `DecodeHookFuncValue` has been added that has
+  access to the full values. [GH-183]
+* Squash is now supported with embedded fields that are struct pointers [GH-205]
+* Empty strings will convert to 0 for all numeric types when weakly decoding [GH-206]
+
+## 1.3.3
+
+* Decoding maps from maps creates a settable value for decode hooks [GH-203]
+
+## 1.3.2
+
+* Decode into interface type with a struct value is supported [GH-187]
+
+## 1.3.1
+
+* Squash should only squash embedded structs. [GH-194]
+
+## 1.3.0
+
+* Added `",omitempty"` support. This will ignore zero values in the source
+  structure when encoding. [GH-145]
+
+## 1.2.3
+
+* Fix duplicate entries in Keys list with pointer values. [GH-185]
+
+## 1.2.2
+
+* Do not add unsettable (unexported) values to the unused metadata key
+  or "remain" value. [GH-150]
+
+## 1.2.1
+
+* Go modules checksum mismatch fix
+
+## 1.2.0
+
+* Added support to capture unused values in a field using the `",remain"` value
+  in the mapstructure tag. There is an example to showcase usage.
+* Added `DecoderConfig` option to always squash embedded structs
+* `json.Number` can decode into `uint` types
+* Empty slices are preserved and not replaced with nil slices
+* Fix panic that can occur in when decoding a map into a nil slice of structs
+* Improved package documentation for godoc
+
 ## 1.1.2
 
 * Fix error when decode hook decodes interface implementation into interface