Drop support for ice cream sandwich

app/build.gradle

@@ -22,7 +22,7 @@ android {
         versionCode 539
         versionName "6.1.3"
         targetSdkVersion 28
-        minSdkVersion 15
+        minSdkVersion 16
         testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
 
         javaCompileOptions {

app/src/main/AndroidManifest.xml

@@ -5,7 +5,7 @@
   package="org.tasks">
 
 
-  <uses-sdk tools:overrideLibrary="timber.log, at.bitfire.ical4android, me.saket.bettermovementmethod"/>
+  <uses-sdk tools:overrideLibrary="at.bitfire.ical4android"/>
 
   <!-- ================================================== Used Permissions = -->
 

app/src/main/java/com/todoroo/andlib/utility/AndroidUtilities.java

@@ -183,10 +183,6 @@ public class AndroidUtilities {
     return Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN_MR1;
   }
 
-  public static boolean atLeastJellybean() {
-    return Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN;
-  }
-
   public static boolean atLeastKitKat() {
     return Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT;
   }

app/src/main/java/com/todoroo/astrid/reminders/ReminderPreferences.java

@@ -5,7 +5,6 @@
  */
 package com.todoroo.astrid.reminders;
 
-import static com.todoroo.andlib.utility.AndroidUtilities.atLeastJellybean;
 import static com.todoroo.andlib.utility.AndroidUtilities.atLeastMarshmallow;
 import static com.todoroo.andlib.utility.AndroidUtilities.atLeastOreo;
 import static com.todoroo.andlib.utility.AndroidUtilities.preOreo;
@@ -115,7 +114,6 @@ public class ReminderPreferences extends InjectingPreferenceActivity {
     requires(atLeastMarshmallow(), R.string.battery_optimization_settings);
     requires(
         preOreo(), R.string.p_rmd_ringtone, R.string.p_rmd_vibrate, R.string.p_led_notification);
-    requires(atLeastJellybean(), R.string.p_bundle_notifications);
   }
 
   @TargetApi(Build.VERSION_CODES.O)

app/src/main/java/org/tasks/preferences/Preferences.java

@@ -3,7 +3,6 @@ package org.tasks.preferences;
 import static android.content.SharedPreferences.Editor;
 import static com.google.common.collect.Iterables.transform;
 import static com.google.common.collect.Sets.newHashSet;
-import static com.todoroo.andlib.utility.AndroidUtilities.atLeastJellybean;
 import static java.util.Collections.emptySet;
 
 import android.content.Context;
@@ -438,7 +437,7 @@ public class Preferences {
   }
 
   public boolean bundleNotifications() {
-    return atLeastJellybean() && getBoolean(R.string.p_bundle_notifications, true);
+    return getBoolean(R.string.p_bundle_notifications, true);
   }
 
   public boolean usePersistentReminders() {