Set version to 5.4.0

CHANGELOG.md

@@ -1,8 +1,8 @@
 ArduinoJson: change log
 =======================
 
-HEAD
-----
+v5.4.0
+------
 
 * Changed `::String` to `ArduinoJson::String` (issue #275)
 * Changed `::Print` to `ArduinoJson::Print` too

appveyor.yml

@@ -1,4 +1,4 @@
-version: 5.3.0.{build}
+version: 5.4.0.{build}
 environment:
   matrix:
   - CMAKE_GENERATOR: Visual Studio 14 2015

library.json

@@ -6,7 +6,7 @@
     "type": "git",
     "url": "https://github.com/bblanchon/ArduinoJson.git"
   },
-  "version": "5.3.0",
+  "version": "5.4.0",
   "authors": {
     "name": "Benoit Blanchon",
     "url": "http://blog.benoitblanchon.fr"

library.properties

@@ -1,5 +1,5 @@
 name=ArduinoJson
-version=5.3.0
+version=5.4.0
 author=Benoit Blanchon <blog.benoitblanchon.fr>
 maintainer=Benoit Blanchon <blog.benoitblanchon.fr>
 sentence=An efficient and elegant JSON library for Arduino.