internal/lsp: hardcode the version string on master

This way, we can tell if someone is building gopls at head, or if they
are using a tagged version. We should only change the version string on
a release branch.

Change-Id: I55eba534baa2e171315fe72242a400e2d2794314
Reviewed-on: https://go-review.googlesource.com/c/tools/+/205159
Reviewed-by: Ian Cottrell <iancottrell@google.com>
diff --git a/internal/lsp/debug/info.go b/internal/lsp/debug/info.go
index 156b76e..4b1477c 100644
--- a/internal/lsp/debug/info.go
+++ b/internal/lsp/debug/info.go
@@ -21,7 +21,7 @@
 )
 
 // Version is a manually-updated mechanism for tracking versions.
-var Version = "v0.1.6"
+var Version = "master"
 
 // This writes the version and environment information to a writer.
 func PrintVersionInfo(w io.Writer, verbose bool, mode PrintMode) {