Use go modules, explicitly update ssh_config dependency

.gitignore

@@ -1 +1,2 @@
 sshc
+vendor/

go.mod

@@ -0,0 +1,6 @@
+module sshc
+
+require (
+	github.com/kevinburke/ssh_config v0.0.0-20190725054713-01f96b0aa0cd
+	github.com/spf13/cobra v0.0.5
+)

go.sum

@@ -0,0 +1,35 @@
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