Merge branch 'master' of https://github.com/bendtherules/react-fiber-traverse into test-multi-react

react and react-dom version combos mentioned together

.travis.yml

@@ -1,6 +1,35 @@
 language: node_js
+matrix:
+  include:
+  - name: "react 16.0.x"
+    env: REACT_V=react@16.0.x REACT_DOM_V=react-dom@16.0.x
+  - name: "react 16.1.x"
+    env: REACT_V=react@16.1.x REACT_DOM_V=react-dom@16.1.x
+  - name: "react 16.2.x"
+    env: REACT_V=react@16.2.x REACT_DOM_V=react-dom@16.2.x
+  - name: "react 16.3.x"
+    env: REACT_V=react@16.3.x REACT_DOM_V=react-dom@16.3.x
+  - name: "react 16.4.x"
+    env: REACT_V=react@16.4.x REACT_DOM_V=react-dom@16.4.x
+  - name: "react 16.5.x"
+    env: REACT_V=react@16.5.x REACT_DOM_V=react-dom@16.5.x
+  - name: "react 16.6.x"
+    env: REACT_V=react@16.6.x REACT_DOM_V=react-dom@16.6.x
+  - name: "react 16.7.x"
+    env: REACT_V=react@16.7.x REACT_DOM_V=react-dom@16.7.x
+  - name: "react 16.8.x"
+    env: REACT_V=react@16.8.x REACT_DOM_V=react-dom@16.8.x
+  - name: "react 16.9.x"
+    env: REACT_V=react@16.9.x REACT_DOM_V=react-dom@16.9.x
+
 notifications:
   email: false
+
+# Install reqd react and react-dom version for each matrix
+before_script:
+  - echo $REACT_V $REACT_DOM_V # log react and react-dom versions
+  - npm i --no-save $REACT_V $REACT_DOM_V  # install them
+
 script:
   - npm run test
   - npx codecov