0.15.1 version bump (#4782)

Author: yxlao

cpp/open3d/version.txt

@@ -1,3 +1,3 @@
 OPEN3D_VERSION_MAJOR 0
 OPEN3D_VERSION_MINOR 15
-OPEN3D_VERSION_PATCH 0
+OPEN3D_VERSION_PATCH 1

docs/versions.js

@@ -18,8 +18,8 @@ document.write('\
             <td><a href="http://www.open3d.org/docs/latest/cpp_api">master C++</a></td>\
         </tr>\
         <tr>\
-            <td><a href="http://www.open3d.org/docs/release">0.15.0 (release)</a></td>\
-            <td><a href="http://www.open3d.org/docs/release/cpp_api">0.15.0 C++ (release)</a></td>\
+            <td><a href="http://www.open3d.org/docs/release">0.15.1 (release)</a></td>\
+            <td><a href="http://www.open3d.org/docs/release/cpp_api">0.15.1 C++ (release)</a></td>\
         </tr>\
         <tr>\
             <td><a href="http://www.open3d.org/docs/0.14.1">0.14.1</a></td>\