Update steal to pre-release

Author: bmomberger-bitovi

package.json

@@ -31,7 +31,7 @@
     "prettier": "1.12.0",
     "pump": "^3.0.0",
     "rollup-plugin-commonjs": "^9.3.4",
-    "steal": "^2.2.0",
+    "steal": "^2.3.0-pre.0",
     "steal-bundler": "^0.3.6",
     "steal-parse-amd": "^1.0.0",
     "steal-rollup": "^0.58.4",