message: Update dot-product-of-two-sparse-vectors.py
diff: @@ -9,7 +9,6 @@ class SparseVector:
  """
  self.lookup = {i:v for i, v in enumerate(nums) if v}
  - # Return the dotProduct of two sparse vectors
  def dotProduct(self, vec):
  """
  :type vec: 'SparseVector'
  