update Changelog

Author: jswhit

Changelog

@@ -1,4 +1,4 @@
- version 1.7.0 (not yet released)
+ version 1.7.0 (tag v1.7.0rel)
 ===============================
  * add support for complex numbers via `auto_complex` keyword to `Dataset` (PR #1295)
  * fix for deprecated Cython `DEF` and `IF` statements using compatibility header
@@ -10,8 +10,6 @@
  * Fix bug in set_collective introduced in PR #1277 (collective mode was
    always set).
 
-
-
  version 1.6.5 (tag v1.6.5rel)
 ===============================
  * fix for issue #1271 (mask ignored if bool MA assinged to uint8 var)