Update README.md to reflect only Go v1.13+ is supported

Fixes https://gitlab.com/gitlab-org/gitlab-workhorse/-/issues/268

Update README.md to reflect only Go v1.13+ is supported
83d084f9 · Stan Hu · c8575e0b · 83d084f9
Commit 83d084f9 authored 4 years ago by Stan Hu
--- a/README.md
+++ b/README.md
@@ -172,7 +172,7 @@ The same applies to `cableBackend` and `cableSocket`.
  
 ## Installation
  
-To install gitlab-workhorse you need [Go 1.8 or
+To install gitlab-workhorse you need [Go 1.13 or
 newer](https://golang.org/dl) and [GNU
 Make](https://www.gnu.org/software/make/).