[TASK] Validate the composer.json

.travis.yml

@@ -18,5 +18,12 @@ install:
 - composer install
 
 script:
-  # Run PHP lint on all PHP files.
+- >
-  - find Classes/ Tests/ -name '*.php' -print0 | xargs -0 -n 1 -P 4 php -l
+  echo;
+  echo "Validating the composer.json";
+  composer validate --no-check-all --no-check-lock --strict;
+
+- >
+  echo;
+  echo "Linting all PHP files";
+  find Classes/ Tests/ -name '*.php' -print0 | xargs -0 -n 1 -P 4 php -l;