store and retrieve app version in package.json

.fabmanager-version

@@ -1 +0,0 @@
-2.6.7

CHANGELOG.md

@@ -1,5 +1,6 @@
 # Changelog Fab Manager
 
+- Nom using standard [package.json](package.json) file to save application version number
 - Fix a bug: on small screens, display of button "change group" overflow
 
 ## v2.6.7 2018 October 4

app/controllers/api/version_controller.rb

@@ -4,7 +4,8 @@ class API::VersionController < API::ApiController
 
   def show
     authorize :version
-    version = File.read('.fabmanager-version')
-    render json: {version: version}, status: :ok
+    package = File.read('package.json')
+    version = JSON.parse(package)['version']
+    render json: { version: version }, status: :ok
   end
-end
+end