Drop spdy module in favor of native https module

package.json

@@ -57,7 +57,6 @@
     "request": "2.88.0",
     "semver": "5.5.1",
     "socket.io": "2.1.1",
-    "spdy": "3.4.7",
     "thelounge-ldapjs-non-maintained-fork": "1.0.2",
     "tlds": "1.203.1",
     "ua-parser-js": "0.7.18",

src/server.js

@@ -108,7 +108,7 @@ module.exports = function() {
 			process.exit();
 		}
 
-		server = require("spdy");
+		server = require("https");
 		server = server.createServer({
 			key: fs.readFileSync(keyPath),
 			cert: fs.readFileSync(certPath),

yarn.lock

@@ -6910,7 +6910,7 @@ spdy-transport@^2.0.18:
     safe-buffer "^5.0.1"
     wbuf "^1.7.2"
 
-spdy@3.4.7, spdy@^3.4.1:
+spdy@^3.4.1:
   version "3.4.7"
   resolved "https://registry.yarnpkg.com/spdy/-/spdy-3.4.7.tgz#42ff41ece5cc0f99a3a6c28aabb73f5c3b03acbc"
   dependencies: