Version 0.6.0

New features and enhancements:

• Graph Attention (GAT) layer and model (stack of GAT layers), with demos #216,
  #315
• Unsupervised GraphSAGE #331 with a demo #335
• Model Ensembles #343
• Community detection based on unsupervised graph representation learning #354
• Saliency maps and integrated gradients for model interpretability #345
• Shuffling of head nodes/edges in node and link generators at each epoch #298

Fixed bugs:

• a bug where seed was not passed to sampler in GraphSAGELinkGenerator constructor #337
• UniformRandomMetaPathWalk doesn't update the current node neighbors #340
• seed value for link mapper #336