chore(node): drop support for Node 8 (#186)

* chore(node): drop support for Node 8

* chore(node): clean up Travis config

* chore(node): allow Node 10

.travis.yml

@@ -1,30 +1,22 @@
 sudo: false
-
 language: node_js
-
 node_js:
-  - "8.9.0"
+  - "10.19.0"
   - stable
 
-install: yarn --ignore-engines --frozen-lockfile
-
-script:
-  - yarn
-  - yarn run-example
+cache:
+  yarn: true
+notifications:
+  email: false
 
+script: yarn run-example
 after_success:
   # run automated release process with semantic-release
-  - if [[ "$TRAVIS_BRANCH" == "master" && "$TRAVIS_EVENT_TYPE" == "push" && "$TRAVIS_NODE_VERSION" == "stable" ]]; then
+  - if [[ "$TRAVIS_BRANCH" == "master" && "$TRAVIS_EVENT_TYPE" == "push" && "$TRAVIS_NODE_VERSION" == "stable"]]; then
       npm i --no-save semantic-release@15 @semantic-release/changelog@3 @semantic-release/git@7;
       semantic-release;
     fi;
 
-cache:
-  yarn: true
-
-notifications:
-  email: false
-
 env:
   global:
   - secure: TFSCNKxxG4gWmLwX7Wlz61sdev46If0tmg9y3GZZXI/WSvcbSsVOj1k5nAhvlfOK7MMgTBC+bLCKuHlhhY7H3ZDbxKW/NaSNk4vNfWjrT7k7OQmmMi93PBXSdwLlQOBWPzyd7ZEZmUV8fBI3IWEORaUcDEPjKE5gSPtiaxynPLQ=

package.json

@@ -14,7 +14,7 @@
     "url": "git://github.com/karma-runner/karma-sauce-launcher.git"
   },
   "engines": {
-    "node": ">= 8.9.0"
+    "node": ">= 10.0.0"
   },
   "husky": {
     "hooks": {