change sdk versions

build.gradle

@@ -66,6 +66,9 @@ android {
     buildToolsVersion '26.0.2'
 
     defaultConfig {
+        minSdkVersion 14
+        targetSdkVersion 26 
+
         testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
 
         // arguments to be passed to functional tests

src/main/AndroidManifest.xml

@@ -21,10 +21,6 @@
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
           package="com.owncloud.android">
 
-    <uses-sdk
-        android:minSdkVersion="14"
-        android:targetSdkVersion="25" />
-
     <!-- GET_ACCOUNTS is needed for API < 23.
         For API >= 23 results in the addition of CONTACTS group to the list of permissions that may be
         dynamically disabled or enabled by the user after installation; but it is not important,