update .gitignore

Change-Id: Ida605bda013f7189f5e42c83f741d39b9180984f
diff --git a/.gitignore b/.gitignore
index 2bcb93f..44b4309 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,3 +1,5 @@
 /Cargo.lock
 /platform
 /target
+/core/target
+/runtime/target