Drop node 6

.travis.yml

@@ -40,10 +40,6 @@ matrix:
       node_js: "8"
       env: NO_WATCH_TESTS=1 JEST="--maxWorkers=2 --cacheDirectory .jest-cache" JOB_PART=integration
       stage: versions
-    - os: linux
-      node_js: "6"
-      env: NO_WATCH_TESTS=1 JEST="--maxWorkers=2 --cacheDirectory .jest-cache" JOB_PART=integration
-      stage: versions
   fast_finish: true
   allow_failures:
     - os: osx

appveyor.yml

@@ -22,7 +22,7 @@ environment:
     - nodejs_version: 10
       job_part: integration
       jest: --maxWorkers=2 --cacheDirectory .jest-cache
-    - nodejs_version: 6
+    - nodejs_version: 8
       job_part: integration
       jest: --maxWorkers=2 --cacheDirectory .jest-cache
 

circle.yml

@@ -1,23 +0,0 @@
-machine:
-  environment:
-    NO_WATCH_TESTS: 1
-
-machine:
-  environment:
-    PATH: "${PATH}:${HOME}/${CIRCLE_PROJECT_REPONAME}/node_modules/.bin"
-
-dependencies:
-  pre:
-    - case $CIRCLE_NODE_INDEX in 0) NODE_VERSION=6 ;; 1) NODE_VERSION=8 ;; esac; nvm install $NODE_VERSION && nvm alias default $NODE_VERSION
-  override:
-    - yarn
-    - yarn link || true && yarn link webpack
-  cache_directories:
-    - ~/.cache/yarn
-
-test:
-  override:
-    - node -v
-    - yarn --version
-    - yarn run circleci:lint
-    - yarn run circleci:test

package.json

@@ -81,7 +81,7 @@
     "xxhashjs": "^0.2.1"
   },
   "engines": {
-    "node": ">=6.11.5"
+    "node": ">=8.9.0"
   },
   "repository": {
     "type": "git",