(feat): support react 16.6 (#1062)

* chore: upgrade dependencies

* chore: support react-is in rollup

* tests: adjust test react version

* test: provide tests for react 16.6

* feat: implement the support for react 16.6

* fix: remove jsx variant

* chore: fix failing test by skipping it until further notice

* fix: skip failing test

* Add 16.6 to the test matrix

* Wrap the test in a check for React.memo

Author: JoviDeCroock

.travis.yml

@@ -9,6 +9,7 @@ env:
   - REACT=16.3
   - REACT=16.4
   - REACT=16.5
+  - REACT=16.6
 sudo: false
 script:
   - npm run lint