internal/coverage/decodemeta: correct wording in unknown version error
Correct the wording in the error message returned by readFileHeader when
encountering a meta-data file with an unsupported version.
Change-Id: I49be1bb1509ccc64e8384103bd7f19382b536c26
GitHub-Last-Rev:
2ab8e05a21443c45635e42d788946bec2478ca99
GitHub-Pull-Request: golang/go#76981
Reviewed-on: https://go-review.googlesource.com/c/go/+/732581
Reviewed-by: Roland Shoemaker <roland@golang.org>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Cherry Mui <cherryyz@google.com>
Reviewed-by: Than McIntosh <thanm@golang.org>