Bump version to 1.8 (#30)

Author: jwlawson

README.md

@@ -16,7 +16,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
     - name: Setup cmake
-      uses: jwlawson/actions-setup-cmake@v1.7
+      uses: jwlawson/actions-setup-cmake@v1.8
       with:
         cmake-version: '3.16.x'
     - name: Use cmake