Merge branch 'release/3.1.1'

Author: wolph

stl/__about__.py

@@ -1,6 +1,6 @@
 __package_name__ = 'numpy-stl'
 __import_name__ = 'stl'
-__version__ = '3.1.0'
+__version__ = '3.1.1'
 __author__ = 'Rick van Hattem'
 __author_email__ = '[email protected]'
 __description__ = ' '.join('''

stl/base.py

@@ -419,7 +419,7 @@ def get_mass_properties(self):
         Documentation can be found here:
         http://www.geometrictools.com/Documentation/PolyhedralMassProperties.pdf
         '''
-        self.check()
+        self.check(True)
 
         def subexpression(x):
             w0, w1, w2 = x[:, 0], x[:, 1], x[:, 2]