Revert multiple language setup

Author: maxymshg

.travis.yml

@@ -1,13 +1,12 @@
-language: rust, node_js
+language: rust
 rust:
   - stable
   - beta
   - nightly
-node_js:
-  - "lts/*"
-  - "8"
 cache: cargo
 before_script:
+  - sudo apt-get update
+  - sudo apt-get install -y nodejs
   - npm i -g prettier
   - if [ "$TRAVIS_RUST_VERSION" = "stable" ]; then (rustup component add rustfmt-preview clippy-preview) fi
 script: