Build: make travis use Mono 3.10.0 instead of 3.2.5

.travis.yml

@@ -2,11 +2,11 @@ language: objective-c
 
 env:
   matrix:
-    - MONO_VERSION="3.2.5"
+    - MONO_VERSION="3.10.0"
 
 install:
-  - wget "http://download.xamarin.com/MonoFrameworkMDK/Macx86/MonoFramework-MDK-${MONO_VERSION}.macos10.xamarin.x86.pkg"
-  - sudo installer -pkg "MonoFramework-MDK-${MONO_VERSION}.macos10.xamarin.x86.pkg" -target /
+ - wget "http://download.mono-project.com/archive/${MONO_VERSION}/macos-10-x86/MonoFramework-MDK-${MONO_VERSION}.macos10.xamarin.x86.pkg"
+ - sudo installer -pkg "MonoFramework-MDK-${MONO_VERSION}.macos10.xamarin.x86.pkg" -target /
 
 script: 
   - ./build.sh Build