chore(package): c8@^7.0.0

chore(package): semantic-release@^15.14.0
chore(scripts): cover@#overwrite c8 -x 'tests/**/*' --temp-directory build/tmp ava && c8 report -r lcov -o build/coverage --temp-directory build/tmp
docs(package): remove keyword null
chore(travis): (jobs.include)
chore(travis): add 13.5.0 remove 13.4.0 (jobs.include.node_js)
chore(travis): (script)

.travis.yml

@@ -10,7 +10,7 @@ jobs:
     - stage: test
       node_js:
         - 12.14.0
-        - 13.4.0
+        - 13.5.0
       script:
         - npm run cover
         - npx codecov

package.json

@@ -29,10 +29,10 @@
   },
   "devDependencies": {
     "ava": "^2.4.0",
-    "c8": "^6.0.1",
+    "c8": "^7.0.0",
     "documentation": "^12.1.4",
     "esm": "^3.2.25",
-    "semantic-release": "^15.13.31"
+    "semantic-release": "^15.14.0"
   },
   "engines": {
     "node": ">=12.14.0"