server: replace tomb with context

All what we need is cancelling. Let's use the standard way for it,
context.

Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>

1 files changed, 0 insertions, 4 deletions

diff --git a/Gopkg.toml b/Gopkg.toml
index 72bab91b..442e34cf 100644
--- a/Gopkg.toml
+++ b/Gopkg.toml
@@ -76,7 +76,3 @@
 [[constraint]]
   name = "google.golang.org/grpc"
   version = "1.5.1"
-
-[[constraint]]
-  branch = "v2"
-  name = "gopkg.in/tomb.v2"