The 'Bleeding Edge' should be built against PHP nightlies; it's a canary, not a requirement

Author: stevegrunwell

.travis.yml

@@ -39,7 +39,7 @@ matrix:
       php: 7.2
       env: WP_VERSION=latest WC_VERSION=latest RUN_CODE_COVERAGE=1
     - name: Bleeding Edge
-      php: 7.3
+      php: nightly
       env: WP_VERSION=trunk WC_VERSION=latest
   allow_failures:
     - name: Code Coverage