enabled pip cache and py3.7 build
diff --git a/.travis.yml b/.travis.yml
index b806fe1..2d4d699 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,5 +1,5 @@
-
 language: python
+cache: pip
 python:
   - "2.6"
   - "2.7"
@@ -8,6 +8,7 @@
   - "3.4"
   - "3.5"
   - "3.6"
+  - "3.7"
   - "nightly"
   - "pypy"
   - "pypy3"
diff --git a/CHANGES.txt b/CHANGES.txt
index b779b6d..a9f5a83 100644
--- a/CHANGES.txt
+++ b/CHANGES.txt
@@ -1,5 +1,5 @@
 
-Revision 0.2.2, released XX-XX-2018
+Revision 0.2.2, released 28-06-2018
 -----------------------------------
 
 - Copyright notice extended to the year 2018