fix(pkg): typo in field "keywords" (#172)

Related to https://github.com/apache/cordova/issues/55
diff --git a/package.json b/package.json
index 05f27be..697901f 100644
--- a/package.json
+++ b/package.json
@@ -5,7 +5,7 @@
   "main": "lib/Api.js",
   "repository": "github:apache/cordova-electron",
   "bugs": "https://github.com/apache/cordova-electron/issues",
-  "kewords": [
+  "keywords": [
     "apache",
     "cordova",
     "cordova:platform",