Update the readme for 1.2.0

Author: maxkfranz

README.md

@@ -317,6 +317,10 @@ The `cy` prop allows for getting a reference to the `cy` Cytoscape object, e.g.:
 
 ## Change log
 
+- v1.2.0
+  - Add support for `headless`, `styleEnabled` and the following (canvas renderer) rendering hints: `hideEdgesOnViewport`, `textureOnViewport`, `motionBlur`, `motionBlurOpacity`, `wheelSensitivity`, `pixelRatio`
+  - Add setup and version explanation to README
+  - Add a default React displayName
 - v1.1.0
   - Add `Component.normalizeElements()` utility function
   - Update style prop docs