Bump version number to 4.0.0

A couple of rather big improvements to performance were applied; greatly improved concurrency with multiple clcache processes, better handling of invocations with multiple source files, an optional caching server for hash sums. The diff since 3.1.1 is quite large already, let's do a major release.
frerich · Dec 15, 2016 · ed8bd87 · ed8bd87
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diff --git a/CHANGELOG.md b/CHANGELOG.md
@@ -1,7 +1,7 @@
 clcache changelog
 =================
 
-## Upcoming release
+## clcache 4.0.0 (2016-12-15)
 
  * Bugfix: Fixed occasional 'Cannot create a file when that file already
    exists' error when adding new objects to the cache (GH #155).

diff --git a/clcache.py b/clcache.py
@@ -26,7 +26,7 @@
 import threading
 from tempfile import TemporaryFile
 
-VERSION = "3.3.1-dev"
+VERSION = "4.0.0"
 
 HashAlgorithm = hashlib.md5