- Travis: Avoid deprecated or aliased keys; make "os" explicit

Author: brettz9

.editorconfig

@@ -12,5 +12,5 @@ indent_style = space
 indent_size = 4
 trim_trailing_whitespace = true
 
-[package.json]
+[*.{json,yml}]
 indent_size = 2

.travis.yml

@@ -1,5 +1,6 @@
-sudo: false
 language: node_js
+os:
+  - linux
 node_js:
   - 10
   - 12
@@ -14,10 +15,10 @@ script:
   - npm run test
   - 'if [ -n "${LINT-}" ]; then npm run eslint; fi'
 env:
-  matrix:
+  jobs:
     - ESLINT=6
     - ESLINT=5
-matrix:
+jobs:
   fast_finish: true
   include:
     - node_js: 'lts/*'