Updated project for upcoming 4.x release

Updated:

* composer branch alias
* build matrix
* frontend dependencies
* minified assets

Author: csarrazi

.travis.yml

@@ -6,8 +6,11 @@ matrix:
       env: deps=low
     - php: 7.2
       env: deps=low
+    - php: 7.3
+      env: deps=low
     - php: 7.1
     - php: 7.2
+    - php: 7.3
   fast_finish: true
 
 install:
@@ -29,7 +32,6 @@ cache:
   directories:
     - node_modules
     - $HOME/.composer/cache/files
-    - bower_components
 
 webhooks:
   urls:

composer.json

@@ -36,7 +36,7 @@
     "extra": {
         "branch-alias": {
             "dev-2.x": "2.3-dev",
-            "dev-master": "3.2-dev"
+            "dev-master": "4.0-dev"
         }
     },
     "autoload": {