Update continuous.yml

Author: zfergus

.github/workflows/continuous.yml

@@ -23,17 +23,13 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        os: [ubuntu-18.04, ubuntu-20.04, macos-10.15, macos-11]
+        os: [ubuntu-latest, macos-latest]
         config: [Debug, Release]
         include:
-          - os: macos-10.15
-            name: macOS 10.15
-          - os: macos-11
-            name: macOS 11
-          - os: ubuntu-18.04
-            name: Ubunutu 18.04
-          - os: ubuntu-20.04
-            name: Ubunutu 20.04
+          - os: macos-lates
+            name: macOS
+          - os: ubuntu-latest
+            name: Ubunutu
     steps:
       - name: Checkout repository
         uses: actions/checkout@v1
@@ -83,7 +79,7 @@ jobs:
 
   Windows:
     name: ${{ matrix.name }} (${{ matrix.config }})
-    runs-on: windows-2019
+    runs-on: windows-latest
     env:
       CC: cl.exe
       CXX: cl.exe