Bump version after releasing 1.3

Author: williewillus

hack-mode.el

@@ -16,7 +16,7 @@
 ;; along with this program.  If not, see <https://www.gnu.org/licenses/>.
 
 ;; Author: John Allen <jallen@fb.com>, Wilfred Hughes <me@wilfred.me.uk>
-;; Version: 1.3.0
+;; Version: 1.4.0
 ;; Package-Requires: ((emacs "25.1") (s "1.11.0"))
 ;; URL: https://github.com/hhvm/hack-mode