update github pipeline macos (#64)

Signed-off-by: turuslan <[email protected]>

Author: turuslan

.github/workflows/ci.yml

@@ -15,7 +15,7 @@ jobs:
       fail-fast: false
       matrix:
         # 3 jobs in total
-        os: [ubuntu-18.04, macOS-10.14]
+        os: [ubuntu-18.04, macOS-latest]
         compiler: [{
           "cc": "gcc",
           "cxx": "g++"
@@ -24,11 +24,11 @@ jobs:
           "cxx": "clang++"
         }]
         exclude:
-          - os: macOS-10.14
+          - os: macOS-latest
             compiler:
               cc: gcc
         include:
-          - os: macOS-10.14
+          - os: macOS-latest
             env:
               CFLAGS: "-I /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/usr/include"
     steps: