Update download link (#288)

Fixed RandLANet mIoU issue on S3DIS dataset and tensorflow. Updated weights link.

Author: sanskar107

README.md

@@ -313,7 +313,7 @@ The table shows the available models and datasets for the segmentation task and
 
 | Model / Dataset    | SemanticKITTI | Toronto 3D | S3DIS | Semantic3D | Paris-Lille3D | ScanNet |
 |--------------------|---------------|----------- |-------|--------------|-------------|---------|
-| RandLA-Net (tf)    | [53.7](https://storage.googleapis.com/open3d-releases/model-zoo/randlanet_semantickitti_202010091306.zip) |  [69.0](https://storage.googleapis.com/open3d-releases/model-zoo/randlanet_toronto3d_202010091250.zip) |  [67.0](https://storage.googleapis.com/open3d-releases/model-zoo/randlanet_s3dis_202010091238.zip)    | [76.0](https://storage.googleapis.com/open3d-releases/model-zoo/randlanet_semantic3d_202012120312utc.zip) |  [70.0](https://storage.googleapis.com/open3d-releases/model-zoo/randlanet_parislille3d_202012160654utc.zip) | - |
+| RandLA-Net (tf)    | [53.7](https://storage.googleapis.com/open3d-releases/model-zoo/randlanet_semantickitti_202010091306.zip) |  [69.0](https://storage.googleapis.com/open3d-releases/model-zoo/randlanet_toronto3d_202010091250.zip) |  [67.0](https://storage.googleapis.com/open3d-releases/model-zoo/randlanet_s3dis_202106011448utc.zip)    | [76.0](https://storage.googleapis.com/open3d-releases/model-zoo/randlanet_semantic3d_202012120312utc.zip) |  [70.0](https://storage.googleapis.com/open3d-releases/model-zoo/randlanet_parislille3d_202012160654utc.zip) | - |
 | RandLA-Net (torch) | [52.8](https://storage.googleapis.com/open3d-releases/model-zoo/randlanet_semantickitti_202009090354utc.pth)        |     [71.2](https://storage.googleapis.com/open3d-releases/model-zoo/randlanet_toronto3d_202010091306utc.pth)  |  [67.0](https://storage.googleapis.com/open3d-releases/model-zoo/randlanet_s3dis_202010091238.pth)  | [76.0](https://storage.googleapis.com/open3d-releases/model-zoo/randlanet_semantic3d_202012120312utc.pth) |  [70.0](https://storage.googleapis.com/open3d-releases/model-zoo/randlanet_parislille3d_202012160654utc.pth) | - |
 | KPConv     (tf)    | [58.7](https://storage.googleapis.com/open3d-releases/model-zoo/kpconv_semantickitti_202010021102utc.zip)         |     [65.6](https://storage.googleapis.com/open3d-releases/model-zoo/kpconv_toronto3d_202012221551utc.zip)  |  [65.0](https://storage.googleapis.com/open3d-releases/model-zoo/kpconv_s3dis_202010091238.zip) | - |  [76.7](https://storage.googleapis.com/open3d-releases/model-zoo/kpconv_parislille3d_202011241550utc.zip) | - |
 | KPConv     (torch) | [58.0](https://storage.googleapis.com/open3d-releases/model-zoo/kpconv_semantickitti_202009090354utc.pth)          |     [65.6](https://storage.googleapis.com/open3d-releases/model-zoo/kpconv_toronto3d_202012221551utc.pth) |  [60.0](https://storage.googleapis.com/open3d-releases/model-zoo/kpconv_s3dis_202010091238.pth)  | - | [76.7](https://storage.googleapis.com/open3d-releases/model-zoo/kpconv_parislille3d_202011241550utc.pth) | - |