Update Gopkg.toml to remove the constraint on zipkin-go-opentracing (#1231)

* Update vendor directory for latest changes.

Signed-off-by: Yong Tang <yong.tang.github@outlook.com>

* Update Gopkg.toml to remove the constraint on zipkin-go-opentracing

As the issue on zipkin-go-opentracing has been fixed. See #1193
for details.

Signed-off-by: Yong Tang <yong.tang.github@outlook.com>

vendor/github.com/apache/thrift/CONTRIBUTING.md

@@ -6,6 +6,14 @@ Thank you for your interest in contributing to the Apache Thrift project!  Infor
  * [Get involved!](http://www.apache.org/foundation/getinvolved.html)
  * [Legal aspects on Submission of Contributions (Patches)](http://www.apache.org/licenses/LICENSE-2.0.html#contributions)
 
+## If you want to build the project locally ##
+
+For Windows systems, see our detailed instructions on the [CMake README](/build/cmake/README.md).
+
+For Windows Native C++ builds, see our detailed instructions on the [WinCPP README](/build/wincpp/README.md).
+
+For unix systems, see our detailed instructions on the [Docker README](/build/docker/README.md).
+
 ## If you want to review open issues... ##
 
  1. Review the [GitHub Pull Request Backlog](https://github.com/apache/thrift/pulls).  Code reviews are open to all.

vendor/github.com/apache/thrift/README.md

@@ -1,7 +1,7 @@
 Apache Thrift
 =============
 
-Last Modified: 2014-03-16
+Last Modified: 2017--10
 
 License
 =======
@@ -171,3 +171,8 @@ To run the cross-language test suite, please run:
 This will run a set of tests that use different language clients and
 servers.
 
+Development
+===========
+
+To build the same way Travis CI builds the project you should use docker.
+We have [comprehensive building instructions for docker](build/docker/README.md).