Add unmaintained typemap (#1406)

crates/typemap/RUSTSEC-0000-0000.md

@@ -0,0 +1,27 @@
+```toml
+[advisory]
+id = "RUSTSEC-0000-0000"
+package = "typemap"
+date = "2019-04-06"
+url = "https://github.com/reem/rust-typemap/issues/45"
+references = ["https://github.com/rustsec/advisory-db/issues/1088"]
+informational = "unmaintained"
+
+[versions]
+patched = []
+```
+# typemap is Unmaintained
+
+The maintainer seems unreachable.
+
+The crate may or may not be usable as-is despite no maintenance and may not work in future versions of Rust.
+
+The last release seems to have been seven years ago.
+
+## Possible Alternative(s)
+
+ The below list has not been vetted in any way and may or may not contain alternatives;
+
+ - [ttmap](https://crates.io/crates/ttmap)
+ - [typemap_rev](https://crates.io/crates/typemap_rev)
+ - [typemap-ors](https://crates.io/crates/typemap-ors)