NOISSUE Update travis CI

Remove Qt < 5.4
Add Qt 5.6

.travis.yml

@@ -13,34 +13,21 @@ os:
  - linux
 # - osx
 env:
- - QT_VERSION=5.0.2
- - QT_VERSION=5.1.1
- - QT_VERSION=5.2.1
- - QT_VERSION=5.3.2
  - QT_VERSION=5.4.2
- - QT_VERSION=5.5.1 # latest
+ - QT_VERSION=5.5.1
+ - QT_VERSION=5.6 # latest
 matrix:
   exclude:
     # only use clang on OS X
     - os: osx
       compiler: gcc
     # only use the qt available from homebrew
-    - os: osx
-      env: QT_VERSION=5.0.2
-    - os: osx
-      env: QT_VERSION=5.1.1
-    - os: osx
-      env: QT_VERSION=5.2.1
-    - os: osx
-      env: QT_VERSION=5.3.2
     - os: osx
       env: QT_VERSION=5.4.2
     - os: osx
       env: QT_VERSION=5.5.1
-  allow_failures:
-    - env: QT_VERSION=5.0.2
-    - env: QT_VERSION=5.1.1
-    - env: QT_VERSION=5.2.1
+    - os: osx
+      env: QT_VERSION=5.6
 
 # Install dependencies
 install: