try fix travis

.travis.yml

@@ -2,9 +2,6 @@ sudo: true
 
 language: java
 
-node_js:
-  - 14
-
 before_cache:
   - rm -rf $HOME/.m2/repository/org/antlr
 cache:

.travis/before-install-linux-javascript.sh

@@ -2,17 +2,7 @@
 
 set -euo pipefail
 
-sudo apt-get update -qq
-
-## download and install nodejs
-#curl -sL https://deb.nodesource.com/setup_14.x | sudo -E bash -
-#sudo apt-get install -qq nodejs
-#
-## download and install nvm
-#curl -o- https://raw.githubusercontent.com/nvm-sh/nvm/v0.36.0/install.sh | sudo -E bash -
-#export NVM_DIR="$HOME/.nvm"
-#[ -s "$NVM_DIR/nvm.sh" ] && \. "$NVM_DIR/nvm.sh"  # This loads nvm
-#
-## use v14 and check
-#sudo nvm use 14
+# use v14 and check
+nvm install 14
+nvm use 14
 node --version