test: add Node.js 10, 12 and 13 in the test matrix

uws is no longer maintained, and did not support Node.js >= 10.

We now use a fork in order to support the newer versions of Node.js.
It is maintained there: https://github.com/mmdevries/uws

And can be installed with: `npm i github:mmdevries/uws#2.4.1`

We could also try to support uWebSockets.js, but it does not have the
same API as ws.

The "engines" attribute has also been added in the package.json file,
since we broke the support for Node.js 6 in the latest minor release.

Source: https://github.com/mmdevries/uws
Related: #583

.travis.yml

@@ -2,7 +2,9 @@ sudo: false
 language: node_js
 node_js:
   - "8"
-  - "9"
+  - "10"
+  - "12"
+  - "13"
 git:
   depth: 1
 notifications:

package.json

@@ -42,7 +42,7 @@
     "prettier": "^1.19.1",
     "s": "0.1.1",
     "superagent": "^3.8.1",
-    "uws": "~9.14.0"
+    "uws": "github:mmdevries/uws#2.4.1"
   },
   "scripts": {
     "lint": "eslint lib/ test/ *.js",
@@ -56,5 +56,8 @@
   },
   "files": [
     "lib/"
-  ]
+  ],
+  "engines" : {
+    "node" : ">=8.0.0"
+  }
 }

test/server.js

@@ -17,11 +17,6 @@ var expect = require("expect.js");
 var request = require("superagent");
 var cookieMod = require("cookie");
 
-// are we running on node < 4.4.3 ?
-var NODE_LT_443 = (function() {
-  var parts = process.versions.node.split(".");
-  return parts[0] < 4 || parts[1] < 4 || parts[2] < 3;
-})();
 // are we running uws wsEngine ?
 var UWS_ENGINE = process.env.EIO_WS_ENGINE === "uws";
 
@@ -1769,7 +1764,6 @@ describe("server", function() {
     });
 
     it("should send and receive data with key and cert (polling)", function(done) {
-      if (UWS_ENGINE && NODE_LT_443) return done();
       var srvOpts = {
         key: fs.readFileSync("test/fixtures/server.key"),
         cert: fs.readFileSync("test/fixtures/server.crt"),
@@ -1810,7 +1804,6 @@ describe("server", function() {
     });
 
     it("should send and receive data with ca when not requiring auth (polling)", function(done) {
-      if (UWS_ENGINE && NODE_LT_443) return done();
       var srvOpts = {
         key: fs.readFileSync("test/fixtures/server.key"),
         cert: fs.readFileSync("test/fixtures/server.crt"),
@@ -1849,6 +1842,9 @@ describe("server", function() {
     });
 
     it("should send and receive data with key and cert (ws)", function(done) {
+      if (UWS_ENGINE) {
+        return this.skip();
+      }
       var srvOpts = {
         key: fs.readFileSync("test/fixtures/server.key"),
         cert: fs.readFileSync("test/fixtures/server.crt"),
@@ -1889,7 +1885,6 @@ describe("server", function() {
     });
 
     it("should send and receive data with pfx (polling)", function(done) {
-      if (UWS_ENGINE && NODE_LT_443) return done();
       var srvOpts = {
         key: fs.readFileSync("test/fixtures/server.key"),
         cert: fs.readFileSync("test/fixtures/server.crt"),
@@ -1929,7 +1924,9 @@ describe("server", function() {
     });
 
     it("should send and receive data with pfx (ws)", function(done) {
-      if (UWS_ENGINE && NODE_LT_443) return done();
+      if (UWS_ENGINE) {
+        return this.skip();
+      }
       var srvOpts = {
         key: fs.readFileSync("test/fixtures/server.key"),
         cert: fs.readFileSync("test/fixtures/server.crt"),