Add bin/dbtk-schema-loader to composer.json

So it can be used from vendor/bin in other projects

Author: joostfaassen

composer.json

@@ -7,6 +7,7 @@
             "email": "j.faassen@linkorb.com"
         }
     ],
+    "bin": ["bin/dbtk-schema-loader"],
     "minimum-stability": "stable",
     "require": {
         "doctrine/dbal": "*",