Feature/chart children (#112)

* updated all charts to support `children`. Deprecated the use of `Decorators`, `Extras` and the `renderGrid` prop

* migrate ProgressCircle to new children api

* migrate piechart to new api

* update changelog

* update readme

* cleanup

* update readme

* update readme

* fix piechart and progress circle.
fix #110

* bump version to 5.0.0

* lint fixes

CHANGELOG.md

@@ -1,12 +1,46 @@
 
-* **Support for horizontal StackedBarChart**
+Version 5.0 is a major overhaul to the "decorator" and "extras" pattern.
+We've simplified the API, made it declarative and added support for
+rendering order.
 
-  StackedBarChart now supports the prop `horizontal`
-  just as a regular BarChart
+All charts and axes now support React children. Meaning that your decorators
+and extras should now be placed as direct children to the chart in question.
+This is a breaking change but a very easy one to migrate (I migrated all storybooks in a matter of minutes),
+see the [examples repo](https://github.com/JesperLekland/react-native-svg-charts-examples)
+and read the [docs](https://github.com/JesperLekland/react-native-svg-charts#react-native-svg-charts) for inspiration.
 
+I want to thank everyone who is contributing by submitting issues and joining
+in on discussions. A special thanks to @narciero, @Sprit3Dan and @RoarRain for
+contributing with PRs.
 
-* **StackedBar/AreaChart adheres to new `extras` api**
+## Breaking Changes
+* **Extras and Decorators have been removed**
+
+    Extras and decorators should now be passed in as children to the chart in question.
+    Each child will be called with similar arguments as before. See
+    [README](https://github.com/JesperLekland/react-native-svg-charts#react-native-svg-charts)
+    for more info.
+
+    Migrating an extra is as simple as just moving it from the `extras` array to a child of the chart.
+    The `decorators` are nearly as easy to migrate. Create a wrapper component around
+    your decorator that accepts the `data` prop, now you yourself can map this array and return as many decorators as you want.
+
+
+* **renderGrid and gridProps have been removed**
+
+    A grid show now be rendered through as a child. We still expose a default `Grid`
+    component as part of the API but this must no manually be added to all charts that want to display a grid.
+
+    As a result of this the following props are deprecated:
+    * `showGrid`
+    * `gridProps`
+    * `renderGrid`
+
+
+* **Grids are consolidate into one**
+
+    Before we hade `Grid.Vertical`,`Grid.Horizontal` and `Grid.Both`,
+    now we simply have `Grid` with a `direction` property. See [README](https://github.com/JesperLekland/react-native-svg-charts#react-native-svg-charts)
+    for more info
 
-  StackedBarChart and StackedAreaChart was still on the legacy `renderExtras`
-  pattern. It has now been migrated to the single `extras` prop api.