Require Emacs 26, as gensym was not readily available in older versions

Author: purcell

.github/workflows/test.yml

@@ -21,10 +21,6 @@ jobs:
     strategy:
       matrix:
         emacs_version:
-          - 24.4
-          - 24.5
-          - 25.1
-          - 25.3
           - 26.1
           - 26.3
           - 27.1

exec-path-from-shell.el

@@ -6,7 +6,7 @@
 ;; Keywords: unix, environment
 ;; URL: https://github.com/purcell/exec-path-from-shell
 ;; Package-Version: 2.2
-;; Package-Requires: ((emacs "24.4"))
+;; Package-Requires: ((emacs "26.1"))
 
 ;; This file is not part of GNU Emacs.