Update go.mod, go.sum and vendor

Running `go mod vendor` generates new additions and deletions.

vendor/github.com/gdamore/tcell/terminfo/base/base.go

@@ -0,0 +1,32 @@
+// Copyright 2019 The TCell Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use file except in compliance with the License.
+// You may obtain a copy of the license at
+//
+//    http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// This is just a "minimalist" set of the base terminal descriptions.
+// It should be sufficient for most applications.
+
+// Package base contains the base terminal descriptions that are likely
+// to be needed by any stock application.  It is imported by default in the
+// terminfo package, so terminal types listed here will be available to any
+// tcell application.
+package base
+
+import (
+	// The following imports just register themselves --
+	// thse are the terminal types we aggregate in this package.
+	_ "github.com/gdamore/tcell/terminfo/a/ansi"
+	_ "github.com/gdamore/tcell/terminfo/v/vt100"
+	_ "github.com/gdamore/tcell/terminfo/v/vt102"
+	_ "github.com/gdamore/tcell/terminfo/v/vt220"
+	_ "github.com/gdamore/tcell/terminfo/x/xterm"
+)