chore: renovate build matrix

Author: saintedlama

.travis.yml

@@ -3,18 +3,20 @@ language: node_js
 sudo: false
 
 node_js:
+  - "13"
+  - "12"
+  - "11"
   - "10"
   - "9"
   - "8"
-  - "7"
-  - "6"
 
 env:
   - MONGODB_VERSION="2.6.12"
   - MONGODB_VERSION="3.0.15"
   - MONGODB_VERSION="3.2.16"
   - MONGODB_VERSION="3.4.7"
   - MONGODB_VERSION="3.6.2"
+  - MONGODB_VERSION="4.2.2"
 
 before_script:
   - wget http://fastdl.mongodb.org/linux/mongodb-linux-x86_64-${MONGODB_VERSION}.tgz -O /tmp/mongodb.tgz