test: Run with node 15

Author: eps1lon

.travis.yml

@@ -7,11 +7,15 @@ node_js:
   - 10.14.2
   - 12
   - 14
+  - 15
   - node
 env:
   - REACT_DIST=latest
   - REACT_DIST=next
   - REACT_DIST=experimental
+  # node15 compat
+  # Revisit once https://github.com/npm/cli/pull/2047 is released.
+  - npm_config_yes=true
 install:
   - npm install
   # as requested by the React team :)