Run Travis tests with Drupal 8.3.

.travis.yml

@@ -10,8 +10,11 @@ php:
 env:
   - MAKE_FILE=drupal-8.1.x.make.yml
   - MAKE_FILE=drupal-8.2.x.make.yml
+  - MAKE_FILE=drupal-8.3.x.make.yml
 
 matrix:
+  allow_failures:
+    - env: MAKE_FILE=drupal-8.3.x.make.yml
   fast_finish: true
 
 services:

.travis/drupal-8.3.x.make.yml

@@ -0,0 +1,19 @@
+api: 2
+
+core: 8.x
+
+projects:
+  drupal: 8.3.x
+  key_value: 1.x
+  conflict:
+    type: module
+    download:
+      type: git
+      branch: 8.x-1.x
+      url: "https://github.com/drupaldeploy/drupal-conflict.git"
+  multiversion:
+    type: module
+    download:
+      type: git
+      branch: 8.x-1.x
+      url: https://github.com/dickolsson/drupal-multiversion.git