feat: custom torrent client version (#341)

pkg/base/version.go

@@ -0,0 +1,10 @@
+package base
+
+// Version is the build version, set at build time, using `go build -ldflags "-X github.com/GopeedLab/gopeed/pkg/base.Version=1.0.0"`.
+var Version string
+
+func init() {
+	if Version == "" {
+		Version = "dev"
+	}
+}