Removing old dependencies and adding contributor

package.json

@@ -1,7 +1,7 @@
 {
    "name": "epub",
    "description": "Parse ePub electronic book files with Node.JS",
-   "version": "0.2.1",
+   "version": "0.3.0",
    "author": "Andris Reinman",
    "contributors": [
       {
@@ -12,6 +12,10 @@
          "name": "Julien Chaumond",
          "email": "chaumond@gmail.com",
          "url": "https://github.com/julien-c"
+      },
+      {
+         "name": "Fabian Stamm",
+         "email": "dev@fabianstamm.de"
       }
    ],
    "homepage": "http://github.com/julien-c/epub",
@@ -35,13 +39,9 @@
       "books"
    ],
    "dependencies": {
-      "adm-zip": "^0.4.11",
       "jszip": "^3.1.5",
       "xml2js": "^0.4.19"
    },
-   "optionalDependencies": {
-      "zipfile": "^0.5.11"
-   },
    "devDependencies": {
       "@types/jszip": "^3.1.4",
       "@types/node": "^10.10.1",