some modifications and clean up into Manifest

app/src/main/AndroidManifest.xml

 <?xml version="1.0" encoding="utf-8"?>
+<!--
+ * This program is free software: you can redistribute it and/or modify
+* it under the terms of the GNU General Public License as published by
+* the Free Software Foundation, either version 3 of the License, or
+* (at your option) any later version.
+*
+* This program is distributed in the hope that it will be useful,
+* but WITHOUT ANY WARRANTY; without even the implied warranty of
+* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+* GNU General Public License for more details.
+*
+* You should have received a copy of the GNU General Public License
+* along with this program. If not, see <http://www.gnu.org/licenses/>.
+*
+* @author xphnx based on Icecons (https://github.com/1C3/ICEcons)
+*
+-->
+
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
-    package="org.xphnx.ameixa"
-    android:minSdkVersion="16"
-    android:targetSdkVersion="23"
-    android:versionCode="1"
-    android:versionName="0.1">
+    package="org.xphnx.ameixa">
 
     <application
         android:allowBackup="true"