Add release date to changelog.

Changelog.md

@@ -1,4 +1,4 @@
-### 0.5.0 (unreleased)
+### 0.5.0 (2018-11-13)
 
 How to update your code:
  * Change every ``.call()`` to a ``.call("")`` and every ``.call(signature, a, b, c)`` to use ``.call(abi.encodeWithSignature(signature, a, b, c))`` (the last one only works for value types).

docs/bugs_by_version.json

@@ -608,5 +608,9 @@
             "ConstantOptimizerSubtraction"
         ],
         "released": "2017-01-31"
+    },
+    "0.5.0": {
+        "bugs": [],
+        "released": "2018-11-13"
     }
 }