main: Check for version 1.18

app/src/main/java/de/ccc/events/badge/card10/main/MainFragment.kt

@@ -213,7 +213,7 @@ class MainFragment : Fragment(), ConnectionStateListener, GattListener {
                         minor = minor_s.toInt()
                     }
 
-                    if (major < 1 || minor < 17) {
+                    if (major < 1 || minor < 18) {
                         val d: AlertDialog = AlertDialog.Builder(context)
                             .setPositiveButton(android.R.string.ok, null)
                             .setMessage(R.string.main_update_message)

app/src/main/res/values/strings.xml

@@ -18,7 +18,7 @@
     <string name="main_button_set_time">Set Time</string>
     <string name="main_button_ecg">ECG</string>
 
-    <string name="main_update_message">The firmware on your card10 is outdated. Please update to version v1.17!\n
+    <string name="main_update_message">The firmware on your card10 is outdated. Please update to version v1.18!\n
         \n
         See our <a href="https://card10.badge.events.ccc.de/firmware/firmwareupdate/">firmware update guide</a> for details.
     </string>