actually build against Coq 8.7.1

ac67833a · Ralf Jung · aa1c2acc · ac67833a
Commit ac67833a authored Dec 17, 2017 by Ralf Jung
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -51,7 +51,7 @@ build-coq.8.7.dev:
 build-coq.8.7.1:
  <<: *template
  variables:
-    OPAM_PINS: "coq version 8.7.0"
+    OPAM_PINS: "coq version 8.7.1"
  except:
  - triggers