HTTP/HTTPS mixed content errors #612 (#613)

* Configure TrustProxies middleware
* Add trusted proxies to deps
* Replace jquery request with axios request code
* Trust current user IP for forwarded headers
* Update dependencies
* Downgrade self-updater package for PHP 7.2

.travis/deploy_script.sh

@@ -140,4 +140,11 @@ else
   artifacts upload --target-paths "/" ${TRAVIS_BRANCH}_version
 fi
 
-curl -X POST --data "{\"content\": \"A new build is available at http://downloads.phpvms.net/$TAR_NAME (${FULL_VERSION})\"}" -H "Content-Type: application/json" $DISCORD_WEBHOOK_URL
+#if [ "$TRAVIS_BRANCH" != "master" ] && [ "$TRAVIS_BRANCH" != "dev" ]; then
+#  echo "Skipping Discord branch update broadcast"
+#else
+  curl -X POST \
+       --data "{\"content\": \"A new build is available at http://downloads.phpvms.net/$TAR_NAME (${FULL_VERSION})\"}" \
+       -H "Content-Type: application/json" \
+       $DISCORD_WEBHOOK_URL
+#fi