fix(package): Re-add main entry

Author: bmuenzenmeyer

package.json

@@ -2,6 +2,7 @@
   "name": "@pattern-lab/edition-node",
   "description": "A pure wrapper around patternlab-node core, the default pattern engine, and supporting frontend assets.",
   "version": "1.0.0-alpha.2",
+  "main": "patternlab-config.json",
   "dependencies": {
     "@pattern-lab/patternengine-node-mustache": "^2.0.0-alpha.1",
     "@pattern-lab/patternlab-node": "^3.0.0-alpha.5",