Added Android SDK required for compilation

package.json

@@ -29,17 +29,21 @@
       "name": "cordova",
       "version": ">=3.6.0"
     },
+    {
+      "name": "cordova-android",
+      "version": ">=6.0.0"
+    },
     {
       "name": "cordova-windows",
       "version": ">=4.2.0"
     },
     {
-      "name": "apple-ios",
-      "version": ">=10.0.0"
+      "name": "android-sdk",
+      "version": ">=26"
     },
     {
-      "name": "cordova-android",
-      "version": ">=6.0.0"
+      "name": "apple-ios",
+      "version": ">=10.0.0"
     }
   ],
   "author": "Sebastián Katzer",

plugin.xml

@@ -42,8 +42,9 @@
     <engines>
         <engine name="cordova"         version=">=3.6.0"  />
         <engine name="cordova-plugman" version=">=4.3.0"  />
-        <engine name="cordova-windows" version=">=4.2.0"  />
         <engine name="cordova-android" version=">=6.0.0"  />
+        <engine name="cordova-windows" version=">=4.2.0"  />
+        <engine name="android-sdk"     version=">=26" />
         <engine name="apple-ios"       version=">=10.0.0" />
     </engines>