feat(node): add initial node v12 support & update min versions (#1003)

- update minimum versions of node 8 & 10 to latest security patches
- add node v12 to supported versions & travis testing (note: allow_failures is set because no public version of Ghost supports node 12 yet)

Author: acburdine

.travis.yml

@@ -1,21 +1,31 @@
 dist: xenial
 language: node_js
 node_js:
-      - 8
-      - 10
+  - 8
+  - 10
 
 cache: yarn
 
 jobs:
   include:
-    - node_js: "10"
+    - node_js: '10'
       env: TEST_SUITE=lint
+    - node_js: '12'
+  allow_failures:
+    - node_js: '12'
 
 # Don't run builds for renovate PRs
 if: NOT head_branch =~ ^renovate
 
-script:
-  - if [ "$TEST_SUITE" == "lint" ]; then yarn run lint; else yarn run test:all; fi
+script: |
+  if [ "$TEST_SUITE" == "lint" ]; then
+    yarn lint
+  elif [ "$TRAVIS_NODE_VERSION" == "12" ]; then
+    yarn test:unit
+    GHOST_NODE_VERSION_CHECK=false yarn test:acceptance
+  else
+    yarn test:all
+  fi
 
 after_success:
- - if [[ "$TRAVIS_NODE_VERSION" == "10" && "$TEST_SUITE" != "lint" ]]; then yarn run coverage; fi
+ - if [[ "$TRAVIS_NODE_VERSION" == "10" && "$TEST_SUITE" != "lint" ]]; then yarn coverage; fi

package.json

@@ -42,7 +42,7 @@
     ]
   },
   "engines": {
-    "node": "^8.10.0 || ^10.13.0"
+    "node": "^8.16.0 || ^10.16.0 || ^12.11.0"
   },
   "preferGlobal": true,
   "dependencies": {