bump version to 5.1

Author: gertjanvanzwieten

nutils/__init__.py

@@ -24,7 +24,7 @@
 assert sys.version_info >= (3, 5)
 assert LooseVersion(numpy.version.version) >= LooseVersion('1.8'), 'nutils requires numpy 1.8 or higher, got {}'.format(numpy.version.version)
 
-version = '5.0'
+version = '5.1'
 version_name = 'farfalle'
 long_version = ('{} "{}"' if version_name else '{}').format(version, version_name)