Update .travis.yml

Author: codeyu

.travis.yml

@@ -1,23 +1,32 @@
 language: csharp
-sudo: false
+sudo: required
 dist: trusty
+addons:
+  apt:
+    packages:
+    - gettext
+    - libcurl4-openssl-dev
+    - libicu-dev
+    - libssl-dev
+    - libunwind8
+    - zlib1g
 env:
   global:
     - DOTNET_SKIP_FIRST_TIME_EXPERIENCE: true
     - DOTNET_CLI_TELEMETRY_OPTOUT: 1
-mono: none
+mono:
+  - 4.0.5
 os:
   - linux
   - osx
-osx_image: xcode8.2
+osx_image: xcode7.1
 branches:
   only:
     - master
     - release
     - dev
     - /^(.*\/)?ci-.*$/
 before_install:
-  - chmod u+x build.sh
   - if test "$TRAVIS_OS_NAME" == "osx"; then brew update; brew install openssl; ln -s /usr/local/opt/openssl/lib/libcrypto.1.0.0.dylib /usr/local/lib/; ln -s /usr/local/opt/openssl/lib/libssl.1.0.0.dylib /usr/local/lib/; fi
 script:
-  - ./build.sh
+  - ./build.sh --quiet verify