move to node 12

.travis.yml

@@ -7,7 +7,7 @@ jobs:
     - stage: test
       name: Test
       node_js:
-        - 10.16.3
+        - 12.15.0
       script:
         - yarn lint
         - yarn test
@@ -16,7 +16,7 @@ jobs:
       name: Deploy
       script: yarn build
       node_js:
-        - 10.16.3
+        - 12.15.0
       deploy:
         provider: npm
         skip_cleanup: true

package.json

@@ -52,5 +52,8 @@
     "ts-node": "^8.4.1",
     "typescript": "^3.5.3",
     "wait-for-expect": "^3.0.1"
+  },
+  "engines": {
+    "node": ">=12.15.0"
   }
 }

tsconfig.json

@@ -6,7 +6,7 @@
     "removeComments": true,
     "emitDecoratorMetadata": true,
     "experimentalDecorators": true,
-    "target": "es6",
+    "target": "ES2019",
     "sourceMap": true,
     "outDir": "./dist",
     "baseUrl": "./src",