Android 5 Lollipop compatibility

app/src/main/java/eu/faircode/email/ActivitySearch.java

@@ -1,11 +1,15 @@
 package eu.faircode.email;
 
 import android.content.Intent;
+import android.os.Build;
 import android.os.Bundle;
 
+import androidx.annotation.RequiresApi;
+
 public class ActivitySearch extends ActivityBase {
 
     @Override
+    @RequiresApi(api = Build.VERSION_CODES.M)
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);