Merge branch 'ralf/drop-8.15' into 'master'

drop support for Coq 8.15

See merge request iris/iris!985

.gitlab-ci.yml

@@ -74,18 +74,12 @@ build-coq.8.17.1:
     DENY_WARNINGS: "1"
     MANGLE_NAMES: "1"
 
-build-coq.8.16.1:
-  <<: *template
-  variables:
-    OPAM_PINS: "coq version 8.16.1"
-    DENY_WARNINGS: "1"
-
 # The oldest version runs in MRs, without name mangling.
-build-coq.8.15.2:
+build-coq.8.16.1:
   <<: *template
   <<: *branches_and_mr
   variables:
-    OPAM_PINS: "coq version 8.15.2"
+    OPAM_PINS: "coq version 8.16.1"
     DENY_WARNINGS: "1"
 
 trigger-stdpp.dev:

CHANGELOG.md

@@ -5,7 +5,7 @@ lemma.
 
 ## Iris master
 
-Coq 8.13 is no longer supported.
+Coq 8.13, 8.14, and 8.15 are no longer supported.
 
 **Changes in `prelude`:**
 

README.md

@@ -30,7 +30,7 @@ Importing Iris has some side effects as the library sets some global options.
 
 This version is known to compile with:
 
- - Coq 8.15.2 / 8.16.1 / 8.17.1 / 8.18.0
+ - Coq 8.16.1 / 8.17.1 / 8.18.0
  - A development version of [std++](https://gitlab.mpi-sws.org/iris/stdpp)
 
 Generally we always aim to support the last two stable Coq releases. Support for