drop node 6 support

We will no longer test on node6 and instead focus on 8+. This won't
break node6 immediately, but we will no longer go out of our way
supporting a version that does not receive security updates.

Signed-off-by: Claudius <opensource@amenthes.de>

.babelrc

@@ -2,7 +2,7 @@
   "presets": [
     ["env", {
       "targets": {
-        "node": "6",
+        "node": "8",
         "uglify": true
       }
     }]

.travis.yml

@@ -4,16 +4,10 @@ cache: yarn
 env:
   global:
     - CXX=g++-4.8
-    - YARN_VERSION=1.15.2
+    - YARN_VERSION=1.16.0
 
 jobs:
   include:
-    - env: task=npm-test
-      node_js:
-        - 6
-      before_install:
-        - curl -o- -L https://yarnpkg.com/install.sh | bash -s -- --version "$YARN_VERSION"
-        - export PATH="$HOME/.yarn/bin:$PATH"
     - env: task=npm-test
       node_js:
         - 8
@@ -26,6 +20,12 @@ jobs:
       before_install:
         - curl -o- -L https://yarnpkg.com/install.sh | bash -s -- --version "$YARN_VERSION"
         - export PATH="$HOME/.yarn/bin:$PATH"
+    - env: task=npm-test
+      node_js:
+        - 12
+      before_install:
+        - curl -o- -L https://yarnpkg.com/install.sh | bash -s -- --version "$YARN_VERSION"
+        - export PATH="$HOME/.yarn/bin:$PATH"
     - env: task=ShellCheck
       script:
         - shellcheck bin/heroku bin/setup

docs/setup/manual-setup.md

@@ -3,7 +3,7 @@ Manual Installation
 
 ## Requirements on your server
 
-- Node.js 6.x or up (test up to 7.5.0) and <10.x
+- Node.js 8.5 or up
 - Database (PostgreSQL, MySQL, MariaDB, SQLite, MSSQL) use charset `utf8`
 - npm (and its dependencies, [node-gyp](https://github.com/nodejs/node-gyp#installation))
 - yarn

package.json

@@ -119,7 +119,7 @@
     "socket.io": "~2.1.1",
     "socket.io-client": "~2.1.1",
     "spin.js": "^2.3.2",
-    "sqlite3": "^4.0.1",
+    "sqlite3": "^4.0.7",
     "store": "^2.0.12",
     "string": "^3.3.3",
     "tedious": "^1.14.0",
@@ -141,7 +141,7 @@
     "**/request": "^2.88.0"
   },
   "engines": {
-    "node": ">=6.x"
+    "node": ">=8.x"
   },
   "bugs": "https://github.com/codimd/server/issues",
   "keywords": [