Custom path

[jayeye]

This is too short to submit as a PR, so here it goes: Add a custom path option; useful when sitting behind a reverse proxy.

diff --git a/server/options.go b/server/options.go
index 3d7f69c..7a444da 100644
--- a/server/options.go
+++ b/server/options.go
@@ -14,2 +14,3 @@ type Options struct {
        RandomUrlLength     int              `hcl:"random_url_length" flagName:"random-url-length" flagDescribe:"Random URL length" default:"8"`
+       Path                string           `hcl:"path" flagName:"path" flagSName:"P" flagDescribe:"Add this string to the URL" default: ""`
        EnableTLS           bool             `hcl:"enable_tls" flagName:"tls" flagSName:"t" flagDescribe:"Enable TLS/SSL" default:"false"`
diff --git a/server/server.go b/server/server.go
index 6411e71..f28a303 100644
--- a/server/server.go
+++ b/server/server.go
@@ -97,3 +97,3 @@ func (server *Server) Run(ctx context.Context, options ...RunOption) error {

-       path := "/"
+       path := "/" + server.options.Path + "/"
        if server.options.EnableRandomUrl {

[EclectickMedia]

Does this also cover config files? If it does, it fixes my issue and ill merge it into my own local source and recompile.

[Sup3rGeo]

@yudai doesn't it make sense to have this too in gotty?