circular-buffer: Add topics to resolve #840
circular-buffer: Add topics to resolve #840


behrtam/xpython,jmluy/xpython,behrtam/xpython,exercism/xpython,exercism/xpython,smalley/python,pheanex/xpython,exercism/python,N-Parsons/exercism-python,exercism/python,N-Parsons/exercism-python,pheanex/xpython,jmluy/xpython,smalley/python