vendor: update all dependencies

* Update all dependencies
  * Remove all `[[constraint]]` from Gopkg.toml
  * Add in the minimum number of `[[override]]` to build
  * Remove go get of github.com/inconshreveable/mousetrap as it is vendored
  * Update docs with new policy on constraints

vendor/github.com/rfjakob/eme/benchmark.bash

@@ -1,3 +1,6 @@
-#!/bin/bash -eu
+#!/bin/bash
 
+set -eu
+
+go build
 go test -bench=.