bugfix: only pack dist files

package-lock.json

 {
     "name": "value-converters",
-    "version": "1.0.0-2",
+    "version": "1.0.0",
     "lockfileVersion": 2,
     "requires": true,
     "packages": {
         "": {
-            "version": "1.0.0-2",
+            "version": "1.0.0",
             "license": "BSD-3-Clause-Clear",
             "dependencies": {
                 "lodash": "^4.17.21",

package.json

 {
     "name": "value-converters",
-    "version": "1.0.0-2",
+    "version": "1.0.0",
     "description": "extended filtering function, sorting, localization, dissolving urls and reusable validators",
     "main": "dist/index.js",
     "scripts": {
         "test": "jest",
         "lint": "eslint .",
         "build": "tsc",
-        "postinstall": "npm run build"
+        "prepare": "npm run build"
     },
+    "files": [
+        "dist"
+    ],
     "repository": {
         "type": "git",
         "url": "https://gitlab.cc-asp.fraunhofer.de/knecht/value-converters.git"