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/nsf/termbox-go/terminfo.go

@@ -69,6 +69,12 @@ func load_terminfo() ([]byte, error) {
 		}
 	}
 
+	// next, /lib/terminfo
+	data, err = ti_try_path("/lib/terminfo")
+	if err == nil {
+		return data, nil
+	}
+
 	// fall back to /usr/share/terminfo
 	return ti_try_path("/usr/share/terminfo")
 }