nyc to replace c8

Author: bourgeoa

.github/workflows/ci.yml

@@ -53,7 +53,7 @@ jobs:
     # test code
     - run: npm run standard
     - run: npm run validate
-    - run: npm run c8
+    - run: npm run nyc
     # Test global install of the package
     - run: npm pack .
     - run: npm install -g solid-server-*.tgz