@bwplotka replaces @beorn7 as maintainer (#134)

Signed-off-by: beorn7 <beorn@grafana.com>
diff --git a/MAINTAINERS.md b/MAINTAINERS.md
index 3fb44f5..8d35aff 100644
--- a/MAINTAINERS.md
+++ b/MAINTAINERS.md
@@ -1 +1 @@
-* Björn Rabenstein <beorn@grafana.com> @beorn7
+* Bartłomiej Płotka <bwplotka@gmail.com>  @bwplotka