fix: Drop support for Emacs 26.x (#163)

Author: jcs090218

.github/workflows/test.yml

@@ -11,7 +11,6 @@ jobs:
       matrix:
         os: [ubuntu-latest, macos-latest, windows-latest]
         emacs-version:
-          - 26.3
           - 27.2
           - 28.2
           - 29.1

Eask

@@ -14,7 +14,7 @@
 (source "gnu")
 (source "melpa")
 
-(depends-on "emacs" "26.1")
+(depends-on "emacs" "27.1")
 (depends-on "dash")
 (depends-on "f")
 (depends-on "ht")

lsp-treemacs.el

@@ -4,7 +4,7 @@
 
 ;; Author: Ivan Yonchovski
 ;; Keywords: languages
-;; Package-Requires: ((emacs "26.1") (dash "2.18.0") (f "0.20.0") (ht "2.0") (treemacs "2.5") (lsp-mode "6.0"))
+;; Package-Requires: ((emacs "27.1") (dash "2.18.0") (f "0.20.0") (ht "2.0") (treemacs "2.5") (lsp-mode "6.0"))
 ;; Homepage: https://github.com/emacs-lsp/lsp-treemacs
 ;; Version: 0.4