chore(deps-dev): bump c8 from 6.0.1 to 7.0.0 (#499)

Author: dependabot-preview[bot]

package.json

@@ -80,7 +80,7 @@
     "@rollup/plugin-json": "4.0.1",
     "@rollup/plugin-node-resolve": "6.0.0",
     "ava": "2.4.0",
-    "c8": "6.0.1",
+    "c8": "7.0.0",
     "cz-conventional-changelog": "3.0.2",
     "del-cli": "3.0.0",
     "eslint": "6.8.0",