Bump requirements for Mac OS X since Qt 5.14.

--HG--
branch : develop

.travis.yml

@@ -19,7 +19,7 @@ jobs:
     env: 
     - DEPLOY=true
     - LEGACY=false
-    osx_image: xcode10
+    osx_image: xcode11
   - os: osx
     compiler: clang
     env: 
@@ -63,7 +63,6 @@ before_install:
     brew update > /dev/null;
     if [[ "$LEGACY" = false ]]; then
       brew install qt5;
-      brew upgrade qt5;
     else
       unset SSL_CERT_FILE;
       brew install https://gist.githubusercontent.com/dismine/c3ac01de38e12edcf22d9e05791adf82/raw/20544ac8e68ef3523f92e15f432bbaf9a6aa2c22/qt5.rb;

common.pri

@@ -29,6 +29,9 @@ macx{
     # Check which minimal OSX version supports current Qt version
     # See page https://doc.qt.io/qt-5/supported-platforms-and-configurations.html
     # For older versions https://doc.qt.io/qt-5.11/supported-platforms-and-configurations.html
+    equals(QT_MAJOR_VERSION, 5):greaterThan(QT_MINOR_VERSION, 13) {# Qt 5.14
+        QMAKE_MACOSX_DEPLOYMENT_TARGET = 10.13
+    } else {
         equals(QT_MAJOR_VERSION, 5):greaterThan(QT_MINOR_VERSION, 11) {# Qt 5.12
             QMAKE_MACOSX_DEPLOYMENT_TARGET = 10.12
         } else {
@@ -58,6 +61,7 @@ macx{
                 }
             }
         }
+    }
 }
 
 # See question on StackOwerflow "QSslSocket error when SSL is NOT used" (http://stackoverflow.com/a/31277055/3045403)