Fix external ABI type name for contracts

docs/bugs.json

@@ -1,4 +1,12 @@
 [
+    {
+        "name": "IncorrectEventSignatureInLibraries",
+        "summary": "Contract types used in events in libraries cause an incorrect event signature hash",
+        "description": "Instead of using the type `address` in the hashed signature, the actual contract name was used, leading to a wrong hash in the logs.",
+        "introduced": "0.3.0",
+        "fixed": "0.5.8",
+        "severity": "very low"
+    },
     {
         "name": "ABIEncoderV2PackedStorage",
         "summary": "Storage structs and arrays with types shorter than 32 bytes can cause data corruption if encoded directly from storage using the experimental ABIEncoderV2.",