Add Crash me (#198)

Allow users to crash the app and test crash reporting

Author: Kmohamed

Sample/Instabug Demo/ViewController.m

@@ -27,7 +27,8 @@ - (instancetype)initWithCoder:(NSCoder *)aDecoder {
                        @"Invoke with different modes...",
                        @"Set primary color",
                        @"Show intro message",
-                       @"Show unread messages count"
+                       @"Show unread messages count",
+                       @"Crash me"
                        ];
     }
 
@@ -66,6 +67,8 @@ - (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath
         [Instabug showIntroMessage];
     } else if (indexPath.row == 6) {
         [self showUnreadMessagesCount];
+    } else if (indexPath.row == 7) {
+        [self crashMe];
     }
 
     [tableView deselectRowAtIndexPath:indexPath animated:YES];
@@ -180,4 +183,8 @@ - (void)showUnreadMessagesCount {
     [self presentViewController:alertController animated:YES completion:nil];
 }
 
+- (void)crashMe {
+    [[[NSArray alloc] init] objectAtIndex:100];
+}
+
 @end