chore: update node versions in ci

.circleci/config.yml

@@ -19,10 +19,14 @@ jobs:
           $NYC yarn test
           $NYC report --reporter text-lcov > coverage.lcov
           curl -s https://codecov.io/bash | bash
-  node-8:
+  node-12:
     <<: *test
     docker:
-      - image: node:8
+      - image: node:12
+  node-10:
+    <<: *test
+    docker:
+      - image: node:10
   release:
     <<: *test
     steps:
@@ -53,4 +57,5 @@ workflows:
             branches: {only: master}
           requires:
             - node-latest
-            - node-8
+            - node-12
+            - node-10

appveyor.yml

@@ -1,5 +1,5 @@
 environment:
-  nodejs_version: "9"
+  nodejs_version: "10"
 cache:
   - '%LOCALAPPDATA%\Yarn -> appveyor.yml'
   - node_modules -> yarn.lock
@@ -17,4 +17,3 @@ after_test:
       bash codecov.sh
 
 build: off
-