ci: disable fail-fast on tests

Author: simPod

.github/workflows/continuous-integration.yml

@@ -88,6 +88,7 @@ jobs:
     runs-on: "ubuntu-18.04"
 
     strategy:
+      fail-fast: false
       matrix:
         php-version:
           - "7.2"
@@ -125,6 +126,7 @@ jobs:
     runs-on: "ubuntu-18.04"
 
     strategy:
+      fail-fast: false
       matrix:
         php-version:
           - "7.2"