Merge pull request #70 from embrace-io/crash-sending-docs

Document crash sending strategy

embrace-android-sdk/src/main/java/io/embrace/android/embracesdk/capture/crash/EmbraceCrashService.kt

@@ -134,8 +134,13 @@ internal class EmbraceCrashService(
             // End, cache and send the session
             sessionService.handleCrash(crash.crashId)
             backgroundActivityService?.handleCrash(crash.crashId)
-            // Send the crash
+
+            // Send the crash. This is not guaranteed to succeed since the process is terminating
+            // and the request is made on a background executor, but data analysis shows that
+            // a surprising % of crashes make it through based on the receive time. Therefore we
+            // attempt to send the crash and if it fails, we will send it again on the next launch.
             deliveryService.sendCrash(crashEvent)
+
             // Indicate that a crash happened so we can know that in the next launch
             crashMarker.mark()
         }