Merge branch 'travis-cpp' of https://github.com/Hikari9/comfortable-swipe into travis-cpp

.travis.yml

@@ -1,19 +1,28 @@
 dist: xenial
 sudo: required
+language: c++
 matrix:
   include:
-    - addons: {apt: {packages: ["g++-8"]}}
+    - env: {MATRIX_EVAL: "CC=gcc-7 && CXX=g++-7"}
-      env: {MATRIX_EVAL: "CC=gcc-7 && CXX=g++-7"}
-    - addons: {apt: {packages: ["g++-8"]}}
-      env: {MATRIX_EVAL: "CC=gcc-8 && CXX=g++-8"}
       addons:
         apt:
           update: true
           sources:
-      - ubuntu-toolchain-r-test
+            - "ubuntu-toolchain-r-test"
           packages:
             - libxdo-dev
             - libinput-tools
+            - g++-7
+    - env: {MATRIX_EVAL: "CC=gcc-8 && CXX=g++-8"}
+      addons:
+        apt:
+          update: true
+          sources:
+            - "ubuntu-toolchain-r-test"
+          packages:
+            - libxdo-dev
+            - libinput-tools
+            - g++-8
 before_install: eval "${MATRIX_EVAL}"
 install: bash install
 script: ./tests/run_tests