ESlint server shouldn't launch for JSON files (#2367)

* ESlint server shouldn't launch for JSON files

JSON has its own server. ESlint server produces warnings and I'm not sure if it generally works with pure json.

* eos instead of eol

Author: artemkovalyov

clients/lsp-eslint.el

@@ -267,7 +267,7 @@ source.fixAll code action."
   :activation-fn (lambda (filename &optional _)
                    (when lsp-eslint-enable
                      (or (string-match-p (rx (one-or-more anything) "."
-                                             (or "ts" "js" "jsx" "tsx" "html" "vue"))
+                                             (or "ts" "js" "jsx" "tsx" "html" "vue")eos)
                                          filename)
                          (derived-mode-p 'js-mode 'js2-mode 'typescript-mode 'html-mode))))
   :priority -1