Update changelog

CHANGELOG.md

@@ -1,6 +1,49 @@
 # Change Log
 All notable changes to this project will be documented in this file. This change log follows the conventions of [keepachangelog.com](http://keepachangelog.com/).
 
+## 0.2.1 (Unreleased)
+### Added 
+- Support for variables
+
+## Changed
+**Breaking changes:**
+- Large refactor of core namespace - API changes
+
+Moved away from huge nested vectors as query definitions to neat query map definitions. After all, simplicity is all that matters.
+Now, queries are defined like this:
+```clj
+{:venia/operation {:operation/type :query
+                   :operation/name "employeeQuery"}
+ :venia/variables [{:variable/name "id"
+                    :variable/type :Int}
+                   {:variable/name "name"
+                    :variable/type :String}]
+ :venia/queries   [{:query/data  [:employee {:id     :$id
+                                             :active true
+                                             :name   :$name}
+                                  :fragment/comparisonFields]
+                    :query/alias :workhorse}
+                   {:query/data  [:employee {:id     :$id
+                                             :active false}
+                                  :fragment/comparisonFields]
+                    :query/alias :boss}]
+ :venia/fragments [{:fragment/name   :comparisonFields
+                    :fragment/type   :Worker
+                    :fragment/fields [:name :address [:friends [:name :email]]]}]}
+```
+
+`:venia/queries` is only one required key, others are optional. However, rest of data needs to be valid as well if added.
+
+Query's data can be also defined as simple vector:
+
+```clj
+{:venia/queries [[:employee {:id 1 :active true} [:name :address [:friends {:id 1} [:name :email]]]]]}
+```
+- Fragments functionality updated to be more explicit
+
+Notice how fragments are defined and referenced in code example above. 
+
+
 ## 0.1.2 - 2017-05-30
 ### Changed
 - Updated clojure and clojurescript to 1.9.0-alpha17 and 1.9.562