add v2.0.1 section in CHANGELOG

CHANGELOG.md

@@ -1,3 +1,19 @@
+## 2.0.1 / not released yet
+
+* Repair nested namespaces, by avoiding prefix duplication #1322. Fixes #1310 by Kunpei Sakai
+
+* Add pattern matches to values for Mustermann::Concat #1333. Fixes #1332 by Dawa Ometto
+
+* Ship the VERSION file with the gem, to allow local unpacking #1338 by Olle Jonsson
+
+* Fix issue with custom error handler on bad request #1351. Fixes #1350 by Jordan Owens
+
+* Override Rack::ShowExceptions#pretty to set custom template #1377. Fixes #1376 by Jordan Owens
+
+* Enhanced path validation in Windows #1379 by Orange Tsai
+
+* Improve development support and documentation by Faheel Ahmad, Shota Iguchi, Olle Jonsson, Manabu Niseki, John Hope, Horacio, Ice-Storm, GraniteRock, Raman Skaskevich, Carlos Azuaje, 284km, Dan Rice and Zachary Scott
+
 ## 2.0.0 / 2017-04-10
 
  * Use Mustermann for patterns #1086 by Konstantin Haase