Switch version to 1.6.0

Especially with the Python version changes, it seems like this justifies
more than a 0.0.1 bump.

beets/__init__.py

@@ -16,7 +16,7 @@
 import confuse
 from sys import stderr
 
-__version__ = '1.5.1'
+__version__ = '1.6.0'
 __author__ = 'Adrian Sampson <adrian@radbox.org>'
 
 

docs/changelog.rst

@@ -1,7 +1,7 @@
 Changelog
 =========
 
-1.5.1 (in development)
+1.6.0 (in development)
 ----------------------
 
 This release now requires Python 3.6 or later (it removes support for Python

docs/conf.py

@@ -11,8 +11,8 @@ master_doc = 'index'
 project = 'beets'
 copyright = '2016, Adrian Sampson'
 
-version = '1.5'
-release = '1.5.1'
+version = '1.6'
+release = '1.6.0'
 
 pygments_style = 'sphinx'
 

setup.py

@@ -54,7 +54,7 @@ if 'sdist' in sys.argv:
 
 setup(
     name='beets',
-    version='1.5.1',
+    version='1.6.0',
     description='music tagger and library organizer',
     author='Adrian Sampson',
     author_email='adrian@radbox.org',