Fix arxiv links in README of neural_gpu model
Fix arxiv links in README of neural_gpu model

As the links was [[link]] the last `]` was included in the url.
xcyan/models,alexgorban/models,jazcollins/models,sshleifer/object_detection_kitti,derekjchow/models,jazcollins/models,jiaphuan/models,jiaphuan/models,cshallue/models,jch1/models,cshallue/models,jch1/models,tombstone/models,cshallue/models,jiaphuan/models,r888888888/models,xcyan/models,derekjchow/models,derekjchow/models,r888888888/models,r888888888/models,cshallue/models,derekjchow/models,xcyan/models,jch1/models,jiaphuan/models,sshleifer/object_detection_kitti,jazcollins/models,jch1/models,zbigniewwojna/text-rcnn,alexgorban/models,derekjchow/models,tombstone/models,alexgorban/models,jazcollins/models,r888888888/models,r888888888/models,jiaphuan/models,jch1/models,jiaphuan/models,jazcollins/models,tombstone/models,tombstone/models,sshleifer/object_detection_kitti,sshleifer/object_detection_kitti,tombstone/models,sshleifer/object_detection_kitti,tombstone/models,jch1/models,alexgorban/models,jazcollins/models,alexgorban/models,xcyan/models,cshallue/models,sshleifer/object_detection_kitti,r888888888/models,xcyan/models,xcyan/models