ci: update nodejs version

BREAKING CHANGE: min required version of NodeJS is 10.17.0

.travis.yml

@@ -7,8 +7,9 @@ cache:
 notifications:
   email: true
 node_js:
-  - "10"
-  - "8"
+  - '10'
+  - '12'
+  - '14'
 script:
   - yarn run coverage
   - yarn run build

package.json

@@ -2,6 +2,9 @@
   "name": "react-relay-network-modern",
   "version": "0.0.0-semantically-released",
   "description": "Network Layer for React Relay and Express (Batch Queries, AuthToken, Logging, Retry)",
+  "engines": {
+    "node": ">=10.17.0"
+  },
   "files": [
     "es",
     "lib",
@@ -29,7 +32,7 @@
   },
   "homepage": "https://github.com/relay-tools/react-relay-network-modern#readme",
   "dependencies": {
-    "core-js": "3",
+    "core-js": "^3.0.0",
     "extract-files": "^9.0.0"
   },
   "peerDependencies": {

yarn.lock

@@ -2289,11 +2289,6 @@ [email protected]:
   resolved "https://registry.yarnpkg.com/core-js-pure/-/core-js-pure-3.1.3.tgz#4c90752d5b9471f641514f3728f51c1e0783d0b5"
   integrity sha512-k3JWTrcQBKqjkjI0bkfXS0lbpWPxYuHWfMMjC1VDmzU4Q58IwSbuXSo99YO/hUHlw/EB4AlfA2PVxOGkrIq6dA==
 
-core-js@3:
-  version "3.6.5"
-  resolved "https://registry.yarnpkg.com/core-js/-/core-js-3.6.5.tgz#7395dc273af37fb2e50e9bd3d9fe841285231d1a"
-  integrity sha512-vZVEEwZoIsI+vPEuoF9Iqf5H7/M3eeQqWlQnYa8FSKKePuYTf5MWnxb5SDAzCa60b3JBRS5g9b+Dq7b1y/RCrA==
-
 core-js@^2.4.0:
   version "2.4.1"
   resolved "https://registry.yarnpkg.com/core-js/-/core-js-2.4.1.tgz#4de911e667b0eae9124e34254b53aea6fc618d3e"