upgrade nan and other dependencies

Author: joeferner

.gitignore

@@ -10,3 +10,5 @@ node-java.cbp
 *.kdev4
 */.kdev_include_paths
 .vscode
+CMakeLists.txt
+cmake-build-debug/

.travis.yml

@@ -4,11 +4,11 @@ jdk:
   - openjdk9
   - openjdk10
   - openjdk11
+  - openjdk21
 env:
-  - NODE_VERSION=7 CC=clang CXX=clang++
-  - NODE_VERSION=8 CC=clang CXX=clang++
-  - NODE_VERSION=11 CC=clang CXX=clang++
-  - NODE_VERSION=12 CC=clang CXX=clang++
+  - NODE_VERSION=16 CC=clang CXX=clang++
+  - NODE_VERSION=18 CC=clang CXX=clang++
+  - NODE_VERSION=20 CC=clang CXX=clang++
 before_install:
   - nvm install $NODE_VERSION
 before_script: