ISSUE hayamiz#154: Fix differences in naming functions of epa.el in e…

…macs

* twittering-mode.el: In Emacs version 27 function
(epa--decode-coding-string) was renamed to (decode-coding-string)
and it's cause the error on snapshot version of Emacs.
Proof:
http://git.savannah.gnu.org/cgit/emacs.git/commit/?id=21ab346a07eff8ba43cb2738dc6752f012b77670

twittering-mode.el

@@ -86,6 +86,11 @@
 			 (list str)))
 		     process-environment)))))
       ad-do-it)))
+
+(when (>= 27 emacs-major-version)
+  ;;  Cheap support newest version of emacs plus backward compatibility
+  (defalias 'epa--decode-coding-string 'decode-coding-string))
+
 (require 'url)
 
 (defgroup twittering-mode nil