Update documentation

Change-Id: Iea3c4b5409e593b1fb070a491ba8a479db32ca58

docs/source/index.rst

diff --git a/docs/source/index.rst b/docs/source/index.rst
index 2b9b8f6..9d73cca 100644
--- a/docs/source/index.rst
+++ b/docs/source/index.rst
@@ -11,7 +11,7 @@
 squares problems.
 
 * Download the latest stable `release
-  <https://ceres-solver.googlecode.com/files/ceres-solver-1.4.0.tar.gz>`_
+  <https://ceres-solver.googlecode.com/files/ceres-solver-1.5.0.tar.gz>`_
   or clone the `repository
   <https://ceres-solver.googlesource.com/ceres-solver>`_