bump version, drop flow dependency, use newer chainpad-server

package.json

@@ -1,7 +1,7 @@
 {
   "name": "cryptpad",
   "description": "realtime collaborative visual editor with zero knowlege server",
-  "version": "3.10.0",
+  "version": "3.11.0",
   "license": "AGPL-3.0+",
   "repository": {
     "type": "git",
@@ -27,7 +27,6 @@
     "ws": "^3.3.1"
   },
   "devDependencies": {
-    "flow-bin": "^0.59.0",
     "jshint": "^2.10.2",
     "less": "2.7.1",
     "lesshint": "^4.5.0",
@@ -42,7 +41,6 @@
     "lint:js": "jshint --config .jshintrc --exclude-path .jshintignore .",
     "lint:server": "jshint --config .jshintrc lib",
     "lint:less": "./node_modules/lesshint/bin/lesshint -c ./.lesshintrc ./customize.dist/src/less2/",
-    "flow": "./node_modules/.bin/flow",
     "test": "node scripts/TestSelenium.js",
     "test-rpc": "cd scripts/tests && node test-rpc",
     "template": "cd customize.dist/src && for page in ../index.html ../privacy.html ../terms.html ../about.html ../contact.html ../what-is-cryptpad.html ../features.html ../../www/login/index.html ../../www/register/index.html ../../www/user/index.html;do echo $page; cp template.html $page; done;",