try to use nvm to use node 10

.travis.yml

@@ -22,6 +22,9 @@ env:
     - LD_LIBRARY_PATH: /usr/local/lib
     - CLIPPY: n
 install:
+  - source $HOME/.nvm/nvm.sh
+  - nvm install 10
+  - nvm use 10
   - curl https://rustwasm.github.io/wasm-pack/installer/init.sh -sSf | sh
 script: ./ci/travis.sh
 notifications:

ci/travis.sh

@@ -94,6 +94,7 @@ check_readme() {
 
 rustc --version
 cargo --version
+node --version
 
 CHANNEL=nightly
 if [ "x${CLIPPY}" = xy ] ; then