Revert "Port .travis.yml from https://github.com/MyHush/SilentDragonLite/blob/denio/.travis.yml"

This reverts commit 5c7445477f.

.travis.yml

@@ -1,28 +1,19 @@
-language: rust
 matrix:
   include:
     # works on Precise and Trusty
     - os: linux
-    - dist: xenial
       compiler: clang
       addons:
         apt:
           sources: ['ubuntu-toolchain-r-test', 'llvm-toolchain-precise-3.7']
           packages: ['clang-3.7', 'g++-8']
 
-before_script:
- - export PATH="$PATH:$HOME/.cargo/bin"
-
 before_install:
- - gem install bundler
- - curl -sSL https://sh.rustup.rs | sh -s -- -y --default-toolchain=nightly --profile=minimal
- - export PATH="$PATH:$HOME/.cargo/bin"
- - sudo add-apt-repository ppa:beineri/opt-qt591-xenial -y
+ - sudo add-apt-repository ppa:beineri/opt-qt591-trusty -y
  - sudo apt-get update -qq
- - sudo apt-get install qt59base qt59websockets libgl1-mesa-dev
+ - sudo apt-get install qt59base qt59websockets 
  - source /opt/qt59/bin/qt59-env.sh
 
-
 script:
  - qmake -v
  - clang++ -v
@@ -33,3 +24,4 @@ script:
  - qmake silentdragon.pro CONFIG+=release -spec linux-g++
  - res/libsodium/buildlibsodium.sh
  - make CC=gcc-8 CXX=g++-8 -j2
+