Update appveyor.yml

appveyor.yml

@@ -128,7 +128,7 @@ for:
       - macdeployqt LeoCAD.app -dmg
       - mv LeoCAD.dmg LeoCAD-macOS-$(git rev-parse --short HEAD).dmg
       - 'curl -s -H "Authorization: token $GITHUB_TOKEN" https://api.github.com/repos/leozide/leocad/commits/master -o repo.txt' 
-      - 'export REMOTE=$(awk -F"'"''"'"'' /"sha"[[:space:]]*:/ { print $(NF-1); exit }'' repo.txt)'
+      - "export REMOTE=$(awk -F'\"' '/\"sha\"[[:space:]]*:/ { print $(NF-1); exit }' file.json)"
       - export LOCAL=$(git rev-parse HEAD)
       - export UPLOADTOOL_ISPRERELEASE=1
       - if [[ "$REMOTE" != "$LOCAL" ]]; then echo "Build no longer current. $REMOTE vs $LOCAL - aborting upload."; exit 0; fi;