Fix the pre-push hook error with different phpunit versions

Now the pre-push hook check first for a composer phpunit, it not found,
try to use a system wide one. If none of them are available, it will
rise an error

pre-push.sh

@@ -1,10 +1,10 @@
 params="--bootstrap vendor/autoload.php tests --testdox --color"
 
-if [ $(command -v phpunit) ]; then
-    phpunit $params
-else
 if [ -d ./vendor/phpunit ]; then
     ./vendor/phpunit/phpunit/phpunit $params
+else
+    if [ $(command -v phpunit) ]; then
+        phpunit $params
     else
         echo "Please, run 'make install' or install phpunit globally to run the tests"
     fi