bumped version to 0.6.1; updated gemspec date

Did not catch this error before pushing to RubyGems. I yanked 0.6.0 from
RubyGems which means I no longer can use that version. Hence the bump.

CHANGELOG.md

@@ -3,6 +3,10 @@ All notable changes to openbel-api will be documented in this file. The curated
 
 This project adheres to [Semantic Versioning][Semantic Versioning].
 
+## [0.6.1][0.6.1] - 2016-03-16
+### Changed
+- Bumped gems specification date. Requires new version because 0.6.0 was yanked from RubyGems.
+
 ## [0.6.0][0.6.0] - 2016-03-16
 ### Added
 - Retrieve evidence in a format supported by BEL translator plugins ([Issue 44][44]).
@@ -62,6 +66,7 @@ Datasets are stored with a URI computed from the scheme and host that is serving
   - Retrieve equivalent namespace values from the individual.
   - Retrieve orthologous namespace values from the individual.
 
+[0.6.1]:                       https://github.com/OpenBEL/openbel-api/compare/0.6.0...0.6.1
 [0.6.0]:                       https://github.com/OpenBEL/openbel-api/compare/0.5.1...0.6.0
 [0.5.1]:                       https://github.com/OpenBEL/openbel-api/compare/0.5.0...0.5.1
 [0.5.0]:                       https://github.com/OpenBEL/openbel-api/compare/0.4.0...0.5.0

VERSION

@@ -1 +1 @@
-0.6.0
+0.6.1