Import weak-table-0.3.0

Test: None
Change-Id: Idcf231392e451e1de74377dce6804c91fd8ac868
diff --git a/.cargo_vcs_info.json b/.cargo_vcs_info.json
new file mode 100644
index 0000000..6f8967e
--- /dev/null
+++ b/.cargo_vcs_info.json
@@ -0,0 +1,5 @@
+{
+  "git": {
+    "sha1": "80489689035c908f1096c07a8a0c51250f3dc979"
+  }
+}