Prepare v4.2.0.

2 files changed, 16 insertions, 2 deletions

diff --git a/CHANGELOG.rst b/CHANGELOG.rst
index eb28e16..f93956a 100644
--- a/CHANGELOG.rst
+++ b/CHANGELOG.rst
@@ -1,3 +1,18 @@
+v4.2.0 (UNRELEASED)
+===================
+
+- Add FIFO cache implementation.
+
+- Add MRU cache implementation.
+
+- Improve behavior of decorators in case of race conditions.
+
+- Improve documentation regarding mutability of caches values and use
+  of key functions with decorators.
+
+- Officially support Python 3.9.
+
+
 v4.1.1 (2020-06-28)
 ===================
 
diff --git a/cachetools/fifo.py b/cachetools/fifo.py
index 38ddca1..9f254f1 100644
--- a/cachetools/fifo.py
+++ b/cachetools/fifo.py
@@ -26,7 +26,6 @@ class FIFOCache(Cache):
         try:
             key = next(iter(self.__order))
         except StopIteration:
-            msg = '%s is empty' % self.__class__.__name__
-            raise KeyError(msg) from None
+            raise KeyError('%s is empty' % type(self).__name__) from None
         else:
             return (key, self.pop(key))