Add sentry for sending crash logs

Gopkg.lock

@@ -40,12 +40,24 @@
   packages = ["quantile"]
   revision = "3a771d992973f24aa725d07868b467d1ddfceafb"
 
+[[projects]]
+  name = "github.com/certifi/gocertifi"
+  packages = ["."]
+  revision = "deb3ae2ef2610fde3330947281941c562861188b"
+  version = "2018.01.18"
+
 [[projects]]
   name = "github.com/fatih/color"
   packages = ["."]
   revision = "5b77d2a35fb0ede96d138fc9a99f5c9b6aef11b4"
   version = "v1.7.0"
 
+[[projects]]
+  branch = "master"
+  name = "github.com/getsentry/raven-go"
+  packages = ["."]
+  revision = "ed7bcb39ff10f39ab08e317ce16df282845852fa"
+
 [[projects]]
   name = "github.com/golang/protobuf"
   packages = ["proto"]
@@ -201,6 +213,6 @@
 [solve-meta]
   analyzer-name = "dep"
   analyzer-version = 1
-  inputs-digest = "95c3e971d63b97b0dc531f67d98401cfa9968b99aacf1eed73ce801bbaadb0cd"
+  inputs-digest = "5aa544c8f252bc366d223acc4156a6203287d5eb72d46c10c937810d79adc864"
   solver-name = "gps-cdcl"
   solver-version = 1