Don't test PHP 7.3 against WP 4.5

Author: Shawn Hooper

.travis.yml

@@ -32,6 +32,10 @@ matrix:
       env: WP_VERSION=latest WP_MULTISITE=1
     - php: 7.3
       env: NPM_TESTS=1
+  exclude:
+    - php: 7.3
+      env: WP_VERSION=4.5
+
 
 before_script:
   - |