Update ci.yml (#172)

Summary:
Remove gcc/g++ version restrictions

Pull Request resolved: #172

Reviewed By: antonis-m

Differential Revision: D53133322

Pulled By: lnyng

fbshipit-source-id: db090e2698a873366f5c77e33cb2d8768750c2d1

.github/workflows/ci.yml

@@ -15,8 +15,8 @@ jobs:
     strategy:
       matrix:
         include:
-          - cc: gcc-8
-            cxx: g++-8
+          - cc: gcc
+            cxx: g++
           - cc: clang
             cxx: clang++
     env:
@@ -32,7 +32,7 @@ jobs:
           libjsoncpp-dev
           googletest
           meson
-          g++-8
+          g++
       - name: Checkout code
         uses: actions/checkout@v2
       - run: meson build/